Best Heavy Duty Trailer Axle Kit for Tandem Trailers

#1 · Best Overall

1. Rockwell American 7,000 lb Tandem Kit

Best for: 14,000-pound tandem replacements.

Why it ranks #1: Two 7,000 lb electric-brake axles deliver 14,000 lb capacity, and the kit includes suspension parts and ST235/80R16 tires for an 89-inch hub face.

Pre-mounted ST235/80R16 radial tires on 8-lug wheels give this 14,000-pound tandem kit a notable installation advantage: the wheel-and-tire assemblies arrive mounted rather than requiring separate tire mounting. Its two 7,000-pound electric-brake axles and suspension hardware suit utility, cargo, boat, landscape, and dump trailers with the specified dimensions.

The 89-inch hub face and 74-inch spring center define the frame fit, while the listed 8-on-6.5-inch bolt pattern specifies wheel compatibility. Two electric-brake axles, double-eye springs, U-bolt kits, and a tandem hanger kit with equalizers and shackles provide the core running gear in one package. Pre-mounted radial tires on 8-lug wheels reduce assembly steps; the 7,000-pound-per-axle rating gives the tandem setup a stated 14,000-pound capacity.

Skip it if you need an 80-inch spring center; the Johnson Trailer Parts Dexter 3,500-pound kit specifies that dimension.

A builder or owner replacing running gear on a trailer matching the 89-inch hub face and 74-inch spring center can use the complete tandem package. Treat those measurements and the 8-on-6.5-inch pattern as firm fit boundaries.

Listed on Amazon as: Rockwell American 7,000 lb Tandem Trailer Axle Kit – Electric Brake Trailer Axles – 89” Hub Face / 74” Spring Center – ST235/80R16 Radial Tires, Double Eye Springs – 14,000 lb Capacity Running Gear

#2 · Widest Hub Face

2. Salo 7,000 lb Tandem Kit

Best for: 14,000-pound slipper-spring tandems.

Why it ranks #2: Its 14,000 lb tandem capacity, 95-inch hub face, 80-inch spring center, slipper springs, and mounted ST235/80R16 tires suit a wide-frame setup.

Slipper springs and mounted ST235/80R16 radial tires distinguish this 14,000-pound tandem package, which combines suspension, axles, and wheels for a trailer build. The 95-inch hub face, 80-inch spring center, and 8-on-6.5-inch pattern specify its frame and wheel fit.

Two 7,000-pound axles provide the listed 14,000-pound tandem capacity, and the 95-inch hub face and 80-inch spring center are specified for most 82-inch-wide trailer frames. The 8-on-6.5-inch bolt pattern identifies the wheel match. A full suspension kit includes slipper springs, U-bolts, and hangers; ST235/80R16 radial tires arrive mounted on 8-lug wheels. These included components reduce the need to source the listed running gear separately.

Skip it if you require double-eye springs; Rockwell American's 85-inch, 7,000-pound tandem kit lists that suspension type.

This package fits buyers seeking 7,000-pound tandem axles, slipper-spring suspension, and mounted tires for a trailer matching the 95-by-80-inch dimensions. Verify the 8-on-6.5-inch wheel pattern and frame measurements against your setup.

Listed on Amazon as: 7000 lb Tandem Trailer Axle Kit, 95 in Hub Face, 80 in Spring Center, 8 on 6.5 Bolt Pattern, Electric Brake Axles, Running Gear Kit

#3 · Shorter Fit

3. Rockwell American 85-inch 7,000 lb Kit

Best for: Compact-frame 14,000-pound tandems.

Why it ranks #3: This 14,000 lb kit pairs 85-inch hub-face and 70-inch spring-center dimensions with 8-lug electric-brake axles and a complete suspension install kit.

An 85-inch hub face and 70-inch spring center set this 14,000-pound Rockwell American tandem kit apart for trailers with tighter specified frame dimensions. It includes two 7,000-pound electric-brake axles, double-eye springs, and mounting hardware, with an 8-on-6.5-inch pattern for matching wheels.

The listed fit is for most 72-inch-wide trailer frames, with an 85-inch hub face and 70-inch spring center to guide frame compatibility. Two 7,000-pound tandem axles give the kit its stated 14,000-pound total capacity, and the 8-on-6.5-inch bolt pattern identifies the wheel match. Double-eye springs, U-bolt kits, and a tandem hanger kit with equalizers, shackles, and hardware provide suspension components for mounting the axles to the trailer frame.

Skip it if you need an 80-inch spring center; Salo Trailer Parts' 7,000-pound kit specifies that dimension with a 95-inch hub face.

A buyer replacing running gear on a trailer matching the 85-inch hub face and 70-inch spring center can use this complete suspension package. The 8-on-6.5-inch pattern and 14,000-pound rating are key fit limits.

Listed on Amazon as: 7000 lb Tandem Trailer Axle Kit, 85 in Hub Face, 70 in Spring Center, 8 on 6.5 Bolt Pattern, Electric Brake Axles, Complete Install Kit

#4 · Drop Axle Option

4. Trailer Parts Outlet 6,000 lb Drop Kit

Best for: Four-inch-drop trailer builds.

Why it ranks #4: Two 6,000 lb electric-brake drop axles provide 12,000 lb tandem capacity, with 4-inch drop, springs, U-bolt kits, and a hanger kit.

Four-inch-drop electric-brake axles make this 12,000-pound tandem kit an option for trailer builds that call for the listed drop-axle configuration. The package combines two 6,000-pound axles with double-eye springs, U-bolt kits, and a tandem hanger kit; its loose spring seats require welding during installation.

The two 6,000-pound electric drum-brake axles establish the stated 12,000-pound tandem capacity, while the 4-inch drop identifies the axle configuration. Four 3,000-pound, 25.25-inch, five-leaf double-eye springs and two 6,000-pound U-bolt kits are included with the tandem hanger kit. Because the spring seats are loose, a builder must weld them in position. The listing also specifies a 6-on-5.5 bolt pattern and says the axles are not ABS compatible.

Skip it if you need ABS-compatible axles; Rockwell American's 5,200-pound tandem kit lists a different axle package without this stated restriction.

A trailer builder seeking the specified 4-inch-drop setup can use this kit's matched axles and suspension components. Account for welding the loose spring seats and the stated lack of ABS compatibility before selecting it.

Listed on Amazon as: 6000 lb Tandem Axle Heavy Duty TK Trailer Kit with Suspension – 12k Capacity (Drop Axle Series), 89/00 (Loose Spring Seats)

#5 · Beam-Only Option

5. Generic 7,000 lb Axle Beam Kit

Best for: Custom axle-beam projects.

Why it ranks #5: The 7,000 lb beam has an 87-inch hub face, straight EZ-Lube spindles, a 3-inch cambered tube, and loose weld-on spring perches.

An 87-inch hub face paired with straight EZ-Lube spindles makes this 7,000-pound axle beam kit a specific option for trailer projects needing that beam geometry. The 3-inch cambered tube and loose weld-on spring perches distinguish it from a complete tandem running-gear package and allow perch placement during fabrication.

This is an axle beam kit, not a listed complete suspension package: the supplied description identifies a 7,000-pound beam, 87-inch hub face, straight EZ-Lube spindles, and a 3-inch cambered tube. Those dimensions and spindle configuration help a builder assess whether the beam matches the intended trailer setup. The spring perches are loose and weld-on, so installation involves positioning and welding them rather than simply bolting on pre-attached seats. The listing does not specify tandem hardware or brakes.

Skip it if you want a complete tandem suspension kit; Salo Trailer Parts' 7,000-pound kit includes axles, slipper springs, U-bolts, and hangers.

A fabricator replacing or assembling a beam-based trailer setup may value the stated hub face, spindle type, and loose perches. Choose it only when a beam kit suits your project; brakes and complete suspension hardware are not listed.

Listed on Amazon as: Heavy-Duty 7000 lb Trailer axle Beam kit with 87" hub face, Straight EZ-Lube spindles, 3" cambered Tube, and Loose Weld-on Spring perches.

#6

6. Salo 5,200 lb Tandem Kit

Best for: 10,400-pound tire-included tandems.

Why it ranks #6: Two 5,200 lb axles provide 10,400 lb total capacity, with electric brakes, suspension components, and mounted ST225/75R15 tires.

Mounted ST225/75R15 radial tires on 6-lug wheels give this 10,400-pound tandem kit a ready-to-install wheel-and-tire component alongside its electric-brake axles. Its 95-inch hub face, 80-inch spring center, and 6-on-5.5-inch bolt pattern identify the frame and wheel dimensions buyers need to match.

The stated 5,200-pound tandem axles provide a listed 10,400-pound total capacity, while the 95-inch hub face and 80-inch spring center target most 82-inch-wide trailer frames. The 6-on-5.5-inch pattern specifies the wheel fit. A full suspension kit includes leaf springs, U-bolts, and hangers, and the radial tires arrive mounted on 6-lug wheels. Together, those components cover axle, suspension, and wheel-and-tire needs in one running-gear package.

Skip it if you need 7,000-pound axles per side; the Rockwell American 85-inch kit lists 7,000-pound tandem axles.

This package suits a buyer assembling or replacing running gear on a trailer matching its 95-inch hub face, 80-inch spring center, and wheel pattern. Its stated 10,400-pound total capacity is the relevant rating boundary.

Listed on Amazon as: 5200 lb Tandem Trailer Axle Kit, 95 in Hub Face, 80 in Spring Center, 6 on 5.5 Bolt Pattern, Electric Brake Axles, Running Gear Kit

#7

7. Rockwell American 5,200 lb Tandem Kit

Best for: 10,400-pound Rockwell tandems.

Why it ranks #7: This complete 10,400 lb tandem setup includes electric-brake axles, double-eye springs, U-bolts, and hangers for a 95-inch hub face and 80-inch spring center.

Posi-Lube spindles are a distinguishing feature of this Rockwell American 5,200-pound tandem kit, which pairs two electric-brake axles with a stated 10,400-pound capacity. Its 95-inch hub face, 80-inch spring center, and 6-on-5.5-inch bolt pattern target a defined frame and wheel fit.

The kit specifies a fit for 82-inch-wide trailer frames, with a 95-inch hub face and 80-inch spring center to check against the trailer. Its 6-on-5.5-inch pattern sets the wheel compatibility, while two 5,200-pound electric-brake axles provide the stated 10,400-pound tandem rating. Double-eye springs, U-bolt kits, and a tandem hanger kit with equalizers and shackles form a complete suspension package. Powder-coated axles and Posi-Lube spindles are also listed features.

Skip it if you need mounted tires included; Salo Trailer Parts' 5,200-pound kit lists ST225/75R15 tires on 6-lug wheels.

This suits buyers replacing tandem axles and suspension on a trailer matching the 95-by-80-inch dimensions and 6-on-5.5-inch pattern. The 10,400-pound rating and included running gear define its practical fit.

Listed on Amazon as: 5,200 lb Tandem Trailer Axle Kit – Electric Brake Axles – Full Suspension Running Gear Kit – 95” Hub Face / 80” Spring Center – 10,400 lb Capacity

#8

8. Dexter 3,500 lb Tandem Kit

Best for: 7,000-pound Dexter tandems.

Why it ranks #8: Its 7,000 lb tandem capacity is below the other complete kits, but it includes electric-brake axles and suspension components for a 95-inch hub face.

Dexter 3,500-pound electric-brake axles paired with E-Z Lube make this tandem kit a fit for buyers seeking a specified 7,000-pound total capacity and a listed lubrication feature. The 95-inch hub face, 80-inch spring center, and 5-on-4.5-inch bolt pattern define its trailer and wheel fit.

The 95-inch hub face and 80-inch spring center are specified for 82-inch-wide trailer frames, helping buyers assess frame geometry before installation. Its 5-on-4.5-inch bolt pattern further narrows wheel compatibility. The package includes two electric-brake axles, double-eye leaf springs, U-bolt kits, and a tandem hanger kit with equalizers and shackles, so suspension and running gear arrive together. E-Z Lube is listed as a feature, and the two 3,500-pound axles make the stated tandem capacity 7,000 pounds.

Skip it if you need a 10,400-pound tandem rating; the Rockwell American 5,200-pound kit lists that capacity.

This kit suits buyers replacing tandem running gear on a trailer matching its 95-inch hub face, 80-inch spring center, and 5-on-4.5-inch pattern. Its stated 7,000-pound total capacity is the key boundary for the intended load rating.

Listed on Amazon as: Dexter 3,500 lb Tandem Trailer Axle Kit – Electric Brake Axles – Full Suspension Running Gear Kit – 95” Hub Face / 80” Spring Center – E-Z Lube – Made in USA – 7,000 lb Capacity