A strong three-leaf trailer spring should match your trailer’s mounting style, dimensions and axle load; the right choice suits owners replacing a worn spring or refreshing a light-duty suspension. This roundup compares ten options, from individual double-eye springs to pairs of slipper springs, with listed capacities ranging from 750 to 1,800 pounds per spring where specified. The selection includes a pair rated for 1,500 pounds per axle, an option with a U-bolt kit, and Dorman replacement springs in several lengths and capacities.
Treat the stated capacity and measurements as fitment checks, not universal compatibility claims. Before ordering, compare your existing spring’s eye or slipper-end style, free length, width and arch, then confirm whether the capacity applies to one spring or a complete axle set.
The TRAILER SUPPLIES 24.25-inch Slipper Spring Kit leads because it includes two three-leaf springs rated at 750 pounds each and a U-bolt mounting kit, making the listed 1,500-pound axle capacity and included hardware clear. It measures 24-1/4 inches from eye center to radius end, is 1-3/4 inches wide, and lists a 9/16-inch bushing ID. Choose it only if your trailer uses the matching slipper-style setup and the dimensions and load rating suit your axle.
Our Top Picks
Best OverallThe pair provides 750 pounds per spring for a stated 1,500-pound axle capacity, and the kit includes U-bolts for the listed 1-3/4-inch round axle fit.
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Best Slipper PairTwo 24-1/4-inch, 1-3/4-inch-wide three-leaf springs provide a clearly stated 1,500-pound combined single-axle capacity.
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Highest CapacityThis double-eye pair is listed at 1,800 pounds per spring, with a 25-1/4-inch eye-to-eye length and 1-3/4-inch width.
View on Amazon- Short Double-Eye Dorman 929-1012
Compare the 3-Leaf Trailer Spring Options
| # | Product | Weight | Dimensions | Buy |
|---|---|---|---|---|
| 1 | 1. TRAILER SUPPLIES Slipper KitBest Overall | — | — | View on Amazon |
| 2 | 2. TRAILER SUPPLIES Radius PairBest Slipper Pair | 16 lb | 24.62 x 1.75 x 1.75 in | View on Amazon |
| 3 | 3. SOUTHWEST WHEEL Double EyeHighest Capacity | 18 lb | — | View on Amazon |
| 4 | 4. Dorman 929-1012Short Double-Eye | 10.08 lb | 23.11 x 1.75 x 4.56 in | View on Amazon |
| 5 | 5. Dorman 929-102926-Inch Eye-to-Eye Replacement | 10.98 lb | 26 x 1.75 x 5.33 in | View on Amazon |
| 6 | 6. FWN-216 Double EyeCompact 1,750-Pound Double-Eye | 10.13 lb | 23.3 x 1.75 x 3.5 in | View on Amazon |
| 7 | 7. Dorman 929-100320-Inch Eye-to-Eye Replacement | 7.21 lb | 20.39 x 1.75 x 3.97 in | View on Amazon |
| 8 | 8. dreamdragon 102020 3/8-Inch Spring Pair | — | — | View on Amazon |
| 9 | 9. FWN 791-1040Manganese-Steel 26-Inch Spring | 11.18 lb | — | View on Amazon |
| 10 | 10. TRP Slipper Spring750-Pound Slipper Spring | — | — | View on Amazon |
Detailed Reviews: Best 3 Leaf Springs For Trailer
Why it ranks #1: The pair provides 750 pounds per spring for a stated 1,500-pound axle capacity, and the kit includes U-bolts for the listed 1-3/4-inch round axle fit.
A pair of 3-leaf slipper springs arrives with a U-bolt mounting kit, combining suspension replacement parts in one listed set. Each spring is rated at 750 pounds for 1,500 pounds combined axle capacity, while the 24 1/4-inch radius-end length identifies the intended geometry for light-duty trailer applications.
The 1 3/4-inch spring width and 9/16-inch bushing ID give useful measurements for checking the existing mounting arrangement, and the listed compatibility codes add identification references. The kit includes four 3/8-by-4 1/4-inch U-bolts, so buyers sourcing springs and mounting pieces together can plan installation around the supplied components. Its stated capacity is for a single axle, making axle rating and slipper-end fit key selection checks.
- Pair of 3-leaf slipper springs
- 1,500-pound combined capacity for a single axle
- Four 3/8-by-4 1/4-inch U-bolts included
- 24 1/4-inch length, width, and bushing ID specified
- The 1,500-pound combined rating is specified for a single axle, not a higher-capacity application.
Skip it if you need a double-eye spring rather than a slipper end; Dorman 929-1012 lists an eye-to-eye configuration.
Choose this set when replacing a compatible single-axle slipper setup and wanting springs plus listed U-bolts together. Its 1,500-pound combined rating and specified axle fit define the boundary; it is not a higher-capacity spring set.
Full product details
| Brand | TRAILER SUPPLIES |
|---|---|
| Included Components | 2 Springs+1 Ubolt |
| Manufacturer | Trailer Supplies |
| Part Number | WA-3500LB-SPK |
| Manufacturer Warranty Description | 2-Year Limited Warranty This product is covered by a 2-Year limited warranty against manufacturing defects only. Warranty does not cover misuse, normal wear and tear, or incorrect installation. Buyer is responsible for all shipping costs related to warranty claims. |
| Model Number | 750×2+1Ubolt |
Listed on Amazon as: 24.25" 3-Leaf Slipper Trailer Leaf Springs (Pair) with 2000 lbs U-Bolt Mounting Kit – 1,500 lbs Axle Capacity – Fits 1-3/4" Round Axles –for Utility & Boat Trailers
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#2 · Best Slipper Pair
2. TRAILER SUPPLIES Radius Pair
- Weight: 16 lb
- Dimensions: 24.62 x 1.75 x 1.75 in
Best for: Single-Axle Radius-End Pair.
Why it ranks #2: Two 24-1/4-inch, 1-3/4-inch-wide three-leaf springs provide a clearly stated 1,500-pound combined single-axle capacity.
A pair of radius-end springs rated at 750 pounds each gives this TRAILER SUPPLIES set a stated combined 1,500-pound capacity for a single axle. The 24 1/4-inch eye-center-to-hook measurement and 1 3/4-inch width help buyers compare its slipper-style geometry against an existing trailer setup.
Each spring has a 9/16-inch inner-diameter bushing and high-strength black bushings, details useful when checking mounting compatibility. The product description says the springs absorb road shock to provide a smoother ride, connecting their construction to trailer operation. Its stated 750-pound rating per spring and 1,500-pound combined capacity clarify the load rating for a single axle, while listed replacement codes offer another reference when identifying a match.
- Pair supplies two 3-leaf radius-end springs
- 750-pound rating per spring; 1,500 pounds combined
- 24 1/4-inch eye-center-to-hook length and 1 3/4-inch width
- 9/16-inch bushing ID and listed replacement codes
- No U-bolt mounting kit is listed as included.
Skip it if you want springs and mounting hardware in one package; the TRAILER SUPPLIES 24.25-inch pair with U-bolt kit fits that workflow better.
This pair suits a single-axle light-duty trailer whose existing slipper springs match the listed dimensions and 1,500-pound combined rating. Choose it when sourcing springs separately is acceptable; mounting hardware is not listed as included.
Full product details
| Brand | TRAILER SUPPLIES |
|---|---|
| Item Weight | 16 pounds |
| Item model number | 750Ibx2 Slipper |
| Manufacturer | TRAILER SUPPLIES |
| Part Number | WA-178-2pcs |
| Model | WA-178 |
| Dimensions | 24.62 x 1.75 x 1.75 inches |
Listed on Amazon as: Pair of 24.25" 3-Leaf Radius End Trailer Spring 1-3/4" Wide for 1,500 Capacity Rated Trailer Axles (Single Axle – 750 per Spring) WIE-3 (2 springs)
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#3 · Highest Capacity
3. SOUTHWEST WHEEL Double Eye
- Weight: 18 lb
Best for: Higher-Rated Double-Eye Pair.
Why it ranks #3: This double-eye pair is listed at 1,800 pounds per spring, with a 25-1/4-inch eye-to-eye length and 1-3/4-inch width.
A two-pack rated at 1,800 pounds per spring gives the SOUTHWEST WHEEL set a clearly stated capacity for buyers comparing double-eye replacements. Each 3-leaf spring measures 25 1/4 inches eye to eye and 1 3/4 inches wide, making its geometry and individual rating easy to assess.
The two-spring pack supports planning a replacement on both sides, and the double-eye ends identify its mounting style. Its 25 1/4-inch eye-to-eye measurement and 1 3/4-inch width provide concrete fit dimensions, while the 1,800-pound rating is stated per spring, not for the pair. That distinction matters when checking suspension requirements; the supplied product details do not list an arch or mounting hardware.
- Two 3-leaf double-eye springs included
- 1,800-pound capacity per spring
- 25 1/4-inch eye-to-eye length
- 1 3/4-inch width listed
- The supplied details do not provide an arch measurement or mounting hardware.
Skip it if you need a listed arch measurement before choosing; Dorman 929-1012 specifies its eye-to-eye spring arch.
This pair suits buyers replacing double-eye springs who need the stated 1,800-pound-per-spring rating and matching 25 1/4-inch geometry. Its supplied details omit arch and hardware information, so those requirements need separate consideration.
Full product details
| Brand | SOUTHWEST WHEEL |
|---|---|
| Item Weight | 18 pounds |
| Manufacturer | SOUTHWEST WHEEL |
| Part Number | SW3 |
| Package Dimensions | 28 x 8 x 8 inches |
Listed on Amazon as: 2-Pack 3-Leaf Double Eye Trailer Leaf Spring (1800 lbs)
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#4 · Short Double-Eye
4. Dorman 929-1012
- Weight: 10.08 lb
- Dimensions: 23.11 x 1.75 x 4.56 in
Best for: 23-Inch Eye-to-Eye Replacement.
Why it ranks #4: The three-leaf double-eye replacement measures 23-1/8 inches long, is 1-3/4 inches wide, and has a stated 1,750-pound capacity.
A 23 1/8-inch eye-to-eye length paired with a 3 1/2-inch arch gives the Dorman 929-1012 a clearly specified replacement profile. Its three leaves and 1,750-pound capacity help buyers evaluate both spring geometry and stated load rating when replacing a worn or damaged trailer spring.
The 1 3/4-inch width adds another concrete measurement for comparing this spring with the existing suspension, while its eye-to-eye ends identify the mounting style. Dorman positions it as a direct replacement for specific vehicles or trailers and cites overloading, collision, cracking, and corrosion as replacement reasons. The stated 1,750-pound capacity and 3 1/2-inch arch make application matching important rather than relying on leaf count alone.
- Three-leaf eye-to-eye design
- 23 1/8-inch length and 1 3/4-inch width listed
- 3 1/2-inch arch specified
- 1,750-pound capacity and direct-replacement positioning
- The listing gives no pair or installation-kit inclusion details.
Skip it if you want a pair of slipper springs and U-bolt mounting hardware together; the TRAILER SUPPLIES 24.25-inch kit provides that combination.
This Dorman suits a trailer owner replacing an eye-to-eye spring where the 23 1/8-inch length, arch, width, and stated capacity align. The listing describes a spring, not a complete pair-and-hardware package.
Full product details
| Brand | Dorman |
|---|---|
| Item Weight | 10.08 pounds |
| Item model number | 929-1012 |
| Manufacturer | Dorman Products |
| Part Number | 929-1012 |
| Model | Dorman 929-1012 |
| Dimensions | 23.11 x 1.75 x 4.56 inches |
Listed on Amazon as: Dorman 929-1012 Utility Trailer Leaf Spring, Eye/Eye, 1 3/4" Width, 23 1/8" Length, 3 1/2" Arch, 3 Leaf, 1750lb Capacity
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#5
5. Dorman 929-1029
- Weight: 10.98 lb
- Dimensions: 26 x 1.75 x 5.33 in
Best for: 26-Inch Eye-to-Eye Replacement.
Why it ranks #5: This three-leaf eye-to-eye spring is 26 inches long and 1-3/4 inches wide, with a stated 1,500-pound capacity for a matching replacement.
A 26-inch eye-to-eye profile with a 4 1/4-inch arch gives the Dorman 929-1029 a defined replacement target for trailers using that spring geometry. Its three leaves and 1,500-pound capacity let buyers assess load rating alongside dimensions when replacing a spring damaged by overloading, collision, cracking, or corrosion.
Dorman lists a 1 3/4-inch width and 26-inch length, giving replacement shoppers concrete dimensions to compare with the existing spring. The 4 1/4-inch arch and eye-to-eye ends further define the configuration, while the 1,500-pound capacity identifies its stated rating. Dorman describes it as a direct replacement for specific vehicles or trailers and says its construction follows strict specifications, so selecting the matching application matters for fit and dependable suspension support.
- Three-leaf eye-to-eye configuration
- 26-inch length and 1 3/4-inch width are specified
- 4 1/4-inch arch and 1,500-pound capacity are listed
- Direct-replacement positioning for specific applications
- The listing provides no pair or mounting-kit inclusion details.
Skip it if you need a pair or mounting hardware supplied together; this listing identifies a leaf spring without stating those inclusions.
For owners replacing a damaged spring on an application matching its eye-to-eye geometry, 26-inch length, arch, and capacity, the Dorman is a dimension-specific option. Its listing does not establish pair or hardware inclusion.
Full product details
| Brand | Dorman |
|---|---|
| Item Weight | 10.98 pounds |
| Item model number | 929-1029 |
| Manufacturer | Dorman Products |
| Part Number | 929-1029 |
| Model | Dorman 929-1029 |
| Dimensions | 26 x 1.75 x 5.33 inches |
Listed on Amazon as: Dorman 929-1029 Utility Trailer Leaf Spring, Eye/Eye, 1 3/4" Width, 26" Length, 4 1/4" Arch, 3 Leaf, 1500lb Capacity
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#6
6. FWN-216 Double Eye
- Weight: 10.13 lb
- Dimensions: 23.3 x 1.75 x 3.5 in
Best for: Compact 1,750-Pound Double-Eye.
Why it ranks #6: The listed three-leaf double-eye spring measures 23.12 inches long and 1.75 inches wide, with a 3.5-inch arch.
The FWN-216 pairs a 23.12-inch length with a 3.5-inch arch and double-eye ends, defining a compact 3-leaf replacement profile. Its stated 1,750-pound capacity gives trailer owners a clear rating to compare with their suspension needs, while the 1.75-inch width provides another fit dimension.
FWN identifies manganese steel as high-strength and high-toughness, linking the material to extended service life. It also says the spring absorbs road vibrations to help protect the trailer hitch system and cargo. The 23.12-inch length, 3.5-inch arch, and double-eye style let buyers compare geometry before installation, while the stated 1,750-pound capacity helps evaluate load requirements. FWN advises checking dimensions and load-bearing specifications for a proper replacement.
- Double-eye three-leaf configuration
- 23.12-inch length and 1.75-inch width
- 3.5-inch arch and 1,750-pound capacity
- Manganese steel and vibration absorption described
- The supplied details do not state whether it is sold singly or as a pair.
Skip it if you need a clearly identified pair with quantity stated; the SOUTHWEST WHEEL 3-leaf double-eye set is listed as a 2-pack.
This FWN suits buyers needing a double-eye spring with the listed compact dimensions and 1,750-pound capacity. Its manganese-steel and vibration-absorption claims add context, but the supplied details do not clarify pack quantity.
Full product details
| Brand | FWN |
|---|---|
| Item Weight | 10.13 pounds |
| Item model number | FWN-216 |
| Manufacturer | FWN |
| Part Number | FWN-216 |
| Model | FWN-216 |
| Dimensions | 23.3 x 1.75 x 3.5 inches |
Listed on Amazon as: Trailer Leaf Spring, 1.75"W, 23.12"L, 3.5" Arch, 3 Leaf 1750lb Double Eye FWN-216
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#7
7. Dorman 929-1003
- Weight: 7.21 lb
- Dimensions: 20.39 x 1.75 x 3.97 in
Best for: 20-Inch Eye-to-Eye Replacement.
Why it ranks #7: This three-leaf eye-to-eye replacement has a 20-3/8-inch length, 1-3/4-inch width and 1,000-pound stated capacity.
A 20 3/8-inch eye-to-eye length and 3 3/16-inch arch define the Dorman 929-1003’s compact replacement profile. Its three leaves and 1,000-pound capacity provide clear geometry and rating details for buyers replacing a damaged spring on a matching trailer application.
The 1 3/4-inch width gives another dimension to compare against the existing suspension, while the eye-to-eye style identifies the mounting configuration. Dorman describes the spring as a direct replacement for specific vehicles or trailers and cites overloading, collision, cracking, and corrosion as reasons for replacement. Its 1,000-pound capacity and 3 3/16-inch arch help buyers check the application carefully rather than assuming that matching length alone is sufficient.
- Three-leaf eye-to-eye configuration
- 20 3/8-inch length and 1 3/4-inch width
- 3 3/16-inch arch specified
- 1,000-pound capacity and direct-replacement positioning
- The listing does not specify a pair or mounting hardware.
Skip it if you need two springs and mounting hardware in one order; the TRAILER SUPPLIES 24.25-inch slipper kit lists both springs and U-bolts.
This Dorman is suited to replacing an eye-to-eye spring where its compact dimensions, arch, and 1,000-pound rating match the trailer. The listing does not identify a pair or mounting kit, so plan around the spring itself.
Full product details
| Brand | Dorman |
|---|---|
| Item Weight | 7.21 pounds |
| Item model number | 929-1003 |
| Manufacturer | Dorman Products |
| Part Number | 929-1003 |
| Model | Dorman 929-1003 |
| Dimensions | 20.39 x 1.75 x 3.97 inches |
Listed on Amazon as: Dorman 929-1003 Utility Trailer Leaf Spring, Eye/Eye, 1 3/4" Width, 20 3/8" Length, 3 3/16" Arch, 3 Leaf, 1000lb Capacity
View on AmazonWhy it ranks #8: The two-pack is listed as 20-3/8 inches eye-center to eye-center, 1-3/4 inches wide and rated for 1,000 pounds.
Two 3-leaf springs with a stated 1,000-pound capacity give the dreamdragon set a defined option for a trailer using a 20 3/8-inch eye-center-to-eye-center length. Its 1 3/4-inch width and cited replacement part number offer practical reference points when comparing an existing spring configuration.
The title specifies two springs, so buyers can plan around a pair rather than sourcing a second spring separately. Its 20 3/8-inch eye-center spacing and 1 3/4-inch width help narrow the fit check, while the 1,000-pound capacity identifies the listed load rating. The product is described as a universal-fit trailer replacement, but those measurements and the stated replacement reference remain important for matching the trailer’s suspension geometry.
- Two 3-leaf springs in the pack
- 1,000-pound capacity stated
- 20 3/8-inch eye-center-to-eye-center length
- 1 3/4-inch width and replacement reference listed
- No spring arch or bushing dimensions are provided in the supplied details.
Skip it if you need a listed arch or bushing measurement before selecting a replacement; Dorman 929-1003 supplies an arch specification.
Consider this pair when a trailer needs two 3-leaf springs matching the stated 20 3/8-inch spacing, width, and capacity. Buyers who need arch or bushing measurements to confirm their setup will need details beyond this listing.
Full product details
| Brand | dreamdragon |
|---|---|
| Item model number | 1020 |
| Manufacturer | Racing Auto Parts |
| Part Number | JHLSC22009 |
| Model | 1020 |
Listed on Amazon as: dreamdragon 2 Pack 3-Leaf Trailer Leaf Springs 1000 Lbs Capacity – 20-3/8" Eye Center-to-Center, 1-3/4" Width, Replaces Part# 1020 Universal Fit for Trailers
View on AmazonWhy it ranks #9: This three-leaf spring lists a 26-inch length, 1.75-inch width, 4.25-inch arch and 1,500-pound capacity, but no mounting style is specified.
High-strength, high-toughness manganese steel is the FWN 791-1040’s specified material, with the listing linking it to extended service life. Its 26-inch length, 1 3/4-inch width, 4 1/4-inch arch, and three-leaf 1,500-pound rating give buyers a detailed profile for spring replacement comparisons.
FWN states that the spring absorbs road vibrations, which it says can protect the trailer hitch system and cargo from damage. The listed 26-inch length and 4 1/4-inch arch help buyers compare its shape with an existing spring, while the 1 3/4-inch width and 1,500-pound rating clarify additional fit and load considerations. FWN advises checking dimensions and load-bearing specifications, making application matching central to selecting this individual spring.
- Manganese-steel construction specified
- 26-inch length and 1 3/4-inch width
- 4 1/4-inch arch and three-leaf profile
- 1,500-pound rating; vibration absorption described
- The supplied listing does not specify eye style or a pair quantity.
Skip it if you require an explicitly identified eye-to-eye spring; Dorman 929-1029 states its eye style and dimensions.
The FWN is for buyers comparing a 26-inch, 1,500-pound-rated spring and valuing the listed manganese-steel material and vibration absorption. Confirm the mounting style from product information before relying on this listing for replacement fit.
Full product details
| Brand | FWN |
|---|---|
| Item Weight | 11.18 pounds |
| Item model number | FWN 791-1040 |
| Manufacturer | FWN |
| Part Number | FWN 791-1040 |
| Model | FWN 791-1040 |
| Package Dimensions | 27.5 x 3 x 1.6 inches |
Listed on Amazon as: Trailer Leaf Spring, 3 Leaf 1500lb, 26"L, 1.75" W, 4.25" Arch FWN 791-1040
View on AmazonWhy it ranks #10: The single three-leaf slipper spring has a 750-pound capacity and 24-5/8-inch length, but offers less complete fitment detail than the other options.
A 750-pound capacity and slipper-style radius end make this single TRP spring a focused choice for a matching trailer suspension. Its listed 24 5/8-inch length and 1 3/4-inch width give buyers two concrete dimensions to compare, while the three-leaf construction identifies its spring configuration.
TRP’s description explains that a slipper spring’s free length is measured from the mounting hole to the tip of the radius end, a useful distinction when comparing its 24 5/8-inch measurement with an existing spring. The 1 3/4-inch width further informs fit checks, while the 750-pound capacity defines its stated load rating. The listing identifies a single spring, so buyers planning a full axle replacement should account for sourcing the other side separately.
- Three-leaf slipper spring
- 750-pound capacity
- 24 5/8-inch length specified
- 1 3/4-inch width listed
- Sold as a single spring rather than a pair.
Skip it if you need a pair and mounting hardware together; the TRAILER SUPPLIES 24.25-inch slipper kit includes both springs and U-bolts.
The TRP fits buyers replacing one slipper spring on a setup matching its 24 5/8-inch length, width, and 750-pound rating. It is a single spring, so a two-sided replacement requires another compatible spring.
Full product details
| Brand | TRP |
|---|---|
| Item model number | 5 |
| Manufacturer | TRP |
Listed on Amazon as: TRP Slipper Spring (3-Leaf) – 750 Lb Capacity – 24-5/8 Inches X 1-3/4 Inches Wide – Single
View on AmazonAvoid spring-length and mounting-style mismatches
A spring can have the right leaf count and load rating yet still fail to fit if its end style or measurement method differs from your trailer. Double-eye springs measure from eye center to eye center, while a slipper spring’s free length runs from the mounting hole to the radius-end tip. The listings illustrate why the number alone is not enough: Dorman 929-1003 is 20-3/8 inches long with eye-to-eye ends, while the TRAILER SUPPLIES Radius Pair measures 24-1/4 inches from eye center to hook end.
The latter is a slipper-style spring, not a substitute for an eye-to-eye spring just because both are three-leaf designs. Measure the old spring using the same endpoints, and check width, arch, bushing details and hanger arrangement.
Spring dimensions may also differ between a relaxed spring and one under load, so verify the replacement against the trailer’s fitment requirements.
Understand the load-rating trade-off
A higher listed spring capacity does not by itself prove that a spring is suitable for your trailer. The listings use different rating descriptions: the TRAILER SUPPLIES Radius Pair specifies 750 pounds per spring and 1,500 pounds combined for a single axle, while SOUTHWEST WHEEL lists 1,800 pounds per spring. Dorman 929-1012 states 1,750 pounds for its individual spring, and Dorman 929-1003 lists 1,000 pounds.
Do not compare those figures as though every number describes the same assembly or axle rating. Confirm whether the manufacturer’s figure applies to one spring, a pair or the axle, then consider the trailer’s required load rating and the capacity of the other suspension and running-gear components.
Choosing a spring that is too stiff or too lightly rated can undermine the intended suspension match; the product data alone does not establish a trailer’s safe payload.
How to Choose a Three-Leaf Trailer Spring
Mounting style and pair configuration
Look first for the same spring-end style and quantity your trailer uses. The Dorman 929-1012, Dorman 929-1029 and Dorman 929-1003 are eye-to-eye springs; TRAILER SUPPLIES Slipper Kit and TRAILER SUPPLIES Radius Pair are slipper-style pairs. SOUTHWEST WHEEL Double Eye is also listed as a two-pack, while several other listings describe an individual spring.
A buyer replacing a double-eye spring should focus on eye-to-eye replacements with matching dimensions; a trailer built for a slipper end needs a compatible radius-end design instead. If you are replacing both sides, a pair listing may better match that job, but verify whether the stated capacity applies per spring or across the pair.
Length, width and arch
Match the spring’s length, width and arch to your trailer rather than choosing by leaf count alone. The listed lengths range from 20-3/8 inches for Dorman 929-1003 to 26 inches for Dorman 929-1029 and FWN 791-1040; most detailed listings specify a 1-3/4-inch width. Dorman 929-1012 is 23-1/8 inches long with a 3-1/2-inch arch, while Dorman 929-1029 lists a 4-1/4-inch arch.
A buyer replacing a compact existing spring should compare the shorter models, while someone matching a longer spring should check the 24- to 26-inch options. Measure with the same endpoints used in the listing, especially when comparing a slipper spring with an eye-to-eye design.
Capacity and rating basis
Choose a spring whose stated capacity and rating basis match the trailer’s requirements. The options span stated capacities from 750 pounds for the single TRP Slipper Spring to 1,800 pounds per spring for SOUTHWEST WHEEL Double Eye; Dorman’s listed individual springs range from 1,000 to 1,750 pounds. The TRAILER SUPPLIES Radius Pair instead states 750 pounds per spring and 1,500 pounds combined for a single axle.
A buyer matching a lighter-duty setup may consider the lower-rated options if the trailer specification calls for them; a buyer needing more capacity should check the higher figures. Confirm whether a figure is per spring, per pair or per axle before comparing products, and do not use spring capacity alone to determine the trailer’s safe payload.
Which Three-Leaf Trailer Spring Should You Choose?
For a light-duty single axle that uses slipper springs and matches the listed measurements, choose TRAILER SUPPLIES Slipper Kit: it includes two springs and U-bolts, with a stated 1,500-pound combined axle capacity. If you need a slipper pair without the listed mounting kit, TRAILER SUPPLIES Radius Pair has the same stated combined capacity. For a double-eye setup with a higher stated per-spring rating, SOUTHWEST WHEEL Double Eye lists 1,800 pounds per spring.
For a single replacement, compare your existing spring’s measurements with Dorman 929-1012, Dorman 929-1029 or Dorman 929-Their stated capacities and lengths differ, so select by verified fit and rating rather than assuming one is interchangeable with another.
Related Buying Guides
- Best 4 Leaf Springs For Trailer
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- Best Leaf Spring Lift Kit
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Frequently Asked Questions
How do I measure a trailer leaf spring for replacement?
Compare the old spring’s length, width, arch, and end style with the replacement listing. For an eye-to-eye spring, check the length from eye center to eye center; for a slipper spring, compare from eye center to radius end. Also verify the spring’s rating and bushing dimensions where listed before choosing.
How can I tell whether my trailer needs double-eye or slipper springs?
Inspect how each end of the existing spring attaches: double-eye springs have an eye at each end, while slipper springs use a radius end that slides into a slipper-style hanger. Match the replacement to that setup, then confirm dimensions and load rating; the two styles are not interchangeable by assumption.
Should trailer leaf springs be replaced in pairs?
Replace both springs on an axle when both are part of the same matched setup, especially if one has failed or shows wear. A pair helps keep the suspension components consistent side to side. Confirm the replacement pair’s dimensions and rating suit the axle rather than selecting by appearance alone.
How should I compare spring capacity with axle capacity?
Check whether a listing states capacity per spring or for the axle, because those figures describe different things. For example, the TRAILER SUPPLIES kit lists two springs rated at 750 pounds each and a combined axle capacity of 1,500 pounds. Choose a rating that suits your trailer’s axle.
Does a leaf spring pair always include mounting hardware?
No. Check the listing contents rather than assuming hardware is included with a pair. The TRAILER SUPPLIES 24.25-inch Slipper Spring Kit includes a U-bolt mounting kit, while the TRAILER SUPPLIES Radius Pair is listed without that mounting kit.
Verify the hardware and spring style match your trailer.
Final Words
For a light-duty single axle using slipper springs, the TRAILER SUPPLIES 24.25-inch Slipper Spring Kit is the clearest match when its dimensions and stated 1,500-pound combined axle capacity suit your trailer. Choose the Radius Pair if you need slipper springs without the listed kit. For double-eye setups or single replacements, match the existing spring’s end style, measurements, and rating before selecting an option.





