Best Aux Fuel Tank For Pickup: Compare 10 Truck Options

#1 · Best Overall

1. RDS MFG INC 60-Gallon Fuel Tank

• Capacity: 60 gallons
• Material: Aluminum
• dimensions: 56 x 13 x 19.25 in
• Compatible with Vehicle Type: Truck

Best for: Short-bed auxiliary fuel users.

Why it ranks #1: Listed for trucks with 60-gallon capacity and 56 x 13 x 19.25-inch dimensions; its note that it fits some short beds makes measurement essential.

A 60-gallon capacity in a 13-inch-wide aluminum tank gives the RDS 71212 a relatively narrow listed footprint for a high-capacity auxiliary setup. RDS says it fits some short beds, making the 56-by-13-by-19.25-inch dimensions especially relevant; the listing explicitly advises measuring and rules out transferring gasoline to another vehicle.

The listed short-bed fit note may help pickup owners identify a possible application, but the instruction to measure means dimensions remain central to planning. RDS describes diesel gravity feed from the tank bottom and connection to the vehicle fuel tank, supporting an auxiliary diesel workflow. Gasoline use is limited to top siphoning with an electric fuel pump, and the product cannot transfer gasoline to another vehicle. Those restrictions define its use as much as its capacity does.

Skip it if you need to transfer gasoline between vehicles; RDS 70326 allows top-siphoned gasoline auxiliary fueling with an electric pump, though not that transfer use.

This RDS is for pickup owners seeking 60 gallons in a narrower tank and whose bed dimensions suit its stated short-bed application. It is not a solution for transferring gasoline to another vehicle.

Listed on Amazon as: RDS MFG INC Fuel Tank – 60-Gallon

#2 · Highest Capacity

2. RDS MFG INC 69-Gallon Tank

• Capacity: 69 gallons
• Material: Aluminum
• dimensions: 57 x 18 x 16 in
• Compatible with Vehicle Type: Multiple vehicle types

Best for: High-capacity diesel haulers.

Why it ranks #2: This aluminum RDS tank holds 69 gallons and measures 57 x 18 x 16 inches; the listing describes auxiliary fueling and diesel gravity feed.

The 69-gallon capacity is the defining feature of this RDS rectangular aluminum tank, giving pickup operators substantial auxiliary-fuel storage for extended work or travel. Its 57-by-18-by-16-inch dimensions make bed space a key planning consideration, while the stated gasoline method is specifically top siphoning with an electric fuel pump.

RDS says its auxiliary tanks connect to the vehicle’s fuel tank, and diesel can gravity-feed from the bottom; those details point to an integrated auxiliary-fuel workflow rather than a tank solely for carrying fuel. For gasoline, the listed condition is top siphoning with an electric pump, so buyers should plan for that method. The aluminum construction and 69-gallon capacity suit buyers prioritizing substantial onboard supply, but the 57-inch length and 18-inch width call for careful truck-bed space planning.

Skip it if you need a shallow, short tank; the listed dimensions are 57 by 18 by 16 inches, and RDS 71212 measures 56 by 13 by 19.25 inches.

Choose this RDS for a pickup owner seeking 69 gallons and a described diesel gravity-feed connection. Its substantial 57-by-18-inch footprint and specified gasoline pumping method are important boundaries when planning bed layout and fuel use.

Listed on Amazon as: RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon

#3 · Toolbox Combo

3. RDS MFG INC 60-Gallon Toolbox Combo

• Capacity: 60 gallons
• Material: Alloy Steel, Aluminum, Stainless Steel
• dimensions: 55 x 20 x 19.5 in
• Compatible with Vehicle Type: Truck

Best for: Fuel-and-toolbox combination.

Why it ranks #3: The 60-gallon RDS combo is listed for trucks and joins a transfer tank with storage; its 55 x 20 x 19.5-inch size needs bed-fit checking.

Combining a 60-gallon auxiliary fuel tank with a toolbox is the defining appeal of this RDS 72548, bringing two truck-bed functions into one listed unit. Its 55-by-20-by-19.5-inch dimensions give buyers a concrete footprint to plan around, and the product information describes diesel gravity feed from the tank bottom.

The toolbox-and-tank combination can consolidate storage and fuel equipment in the bed, while the 60-gallon capacity offers substantially more fuel storage than compact auxiliary tanks. RDS describes its auxiliary tanks as connecting to the vehicle fuel tank and says diesel can gravity-feed from the bottom, supporting an integrated diesel setup. The listed alloy steel, aluminum, and stainless steel materials and 55-inch length should be considered when planning placement and available bed access.

Skip it if you want a shallow standalone tank; RDS 71804 is listed at 50 by 20 by 9 inches and has no toolbox combination stated.

This RDS suits truck owners who want a toolbox and 60-gallon auxiliary tank together, especially for a described diesel gravity-feed arrangement. Its full listed footprint makes bed-space and access planning central to the decision.

Listed on Amazon as: RDS MFG INC – 72548 Fuel Transfer Tank/Auxiliary Fuel Tank/Toolbox Combo – 60 Gallon

#4

4. RDS MFG INC 37-Gallon Tank

• Capacity: 37 gallons
• Material: Aluminum
• dimensions: 50 x 20 x 9 in
• Compatible with Vehicle Type: Car

Best for: Moderate-capacity diesel setups.

Why it ranks #4: RDS specifies 37-gallon aluminum capacity, 50 x 20 x 9-inch dimensions, and auxiliary fueling; its vehicle compatibility is listed as car, not truck.

A 37-gallon capacity in a 50-by-20-by-9-inch aluminum tank gives this RDS model a comparatively shallow profile among the listed dimensions. That shape can help buyers plan a lower-profile bed installation, while the product information describes diesel gravity feed and limits gasoline auxiliary fueling to top siphoning with an electric pump.

The 9-inch listed height is useful for buyers balancing added fuel with available bed space, while the 37-gallon volume offers less storage than the 60- and 69-gallon RDS options. RDS describes its auxiliary tanks as connecting to the vehicle fuel tank and diesel as gravity-feeding from the tank bottom, supporting an auxiliary diesel workflow. Gasoline use has a different stated method: siphoning from the top with an electric fuel pump.

Skip it if you need 60 gallons or more; RDS 71212 lists 60 gallons, while this model holds 37.

This RDS suits pickup owners who want a 37-gallon aluminum auxiliary tank with a 9-inch listed height and a described diesel gravity-feed option. Its capacity and gasoline pumping condition are the key limits to weigh against your setup.

Listed on Amazon as: RDS MFG INC Auxiliary Fuel Tank 37Gal – 71804

#5 · Storage Combo

5. RDS MFG INC 20-Gallon Combo

• Capacity: 20 gallons
• Material: Aluminum
• dimensions: 50 x 21 x 7 in
• Compatible with Vehicle Type: Truck

Best for: Low-profile diesel transfer.

Why it ranks #5: The 20-gallon aluminum unit is designed for pickup-bed transfer of diesel and other nonflammable liquids, with a storage box and heavy-duty mounting brackets.

At 7 inches high, this 20-gallon RDS aluminum tank offers a notably low profile for pickup-bed fuel transfer and storage. The product description specifies diesel and other nonflammable liquids for moving from a truck bed to remote or heavy equipment, while its 50-by-21-inch footprint still needs bed-space planning.

Fully welded seams and a pressure test submerged to check for leaks are specified construction and inspection details. Heavy-duty aluminum mounting brackets support securing the tank in a pickup bed, while the 20-gallon capacity keeps its storage role more modest than the larger tanks in this group. Its description identifies diesel and other nonflammable liquids for equipment transfer, not gasoline auxiliary fueling, so match the fuel and workflow to that stated use.

Skip it if you want a vehicle-tank auxiliary connection; RDS 71804 describes connecting to the vehicle tank and diesel gravity feed.

Pick this RDS for a low-profile pickup-bed tank used to transfer diesel or other nonflammable liquids to equipment. Its 20-gallon capacity and stated transfer purpose set clear limits for buyers wanting a larger integrated auxiliary supply.

Listed on Amazon as: Rds Aluminum 74551 20 Gal Rectangular Auxiliary Fuel Tank44

#6 · Most Compact

6. JSD AUTO PARTS 3.25-Gallon Tank

• Capacity: 3.25 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Universal

Best for: Compact monitored fuel storage.

Why it ranks #6: The universal aluminum tank holds 3.25 gallons and includes a level gauge, cap, and two brackets; its small capacity suits limited-volume applications.

An integrated level gauge distinguishes this compact 3.25-gallon JSD aluminum tank, letting an operator monitor the fuel level at the tank. Its 8-by-16-inch description, 1/4-inch NPT outlet, and included brackets and cap make it a small-scale option for universal vehicle applications rather than a large auxiliary reserve.

The built-in gauge supports checking remaining fuel without relying only on estimates, while the 1/4-inch NPT outlet provides a specified connection detail for planning the fuel line. Two included brackets and a cap give buyers listed mounting and closure components. The 3.25-gallon capacity is far below the larger pickup tanks in this roundup, so it suits a compact auxiliary or equipment-related role, not drivers seeking a major extension of onboard fuel range.

Skip it if you need tens of gallons for a pickup; RDS 71804 holds 37 gallons and lists diesel gravity feed.

Choose this JSD when a compact tank, visible level gauge, and specified outlet suit your installation. Its 3.25-gallon capacity is the clear boundary: it cannot match the reserve volume of full-size pickup auxiliary tanks.

Listed on Amazon as: JSD 3.25 Gallons 8" x 16" Auxiliary Aluminum Gas Tank Fuel Tank With Level Gauge 1/4"NPT Outlet

#7

7. Dee Zee DZ91753 Transfer Tank

• Capacity: 110 gallons
• Material: Aluminum

Best for: Maximum-volume bed haulers.

Why it ranks #7: This aluminum tank is listed at 110 gallons, with mounting tabs, venting cap and coupler, and dimensions of 48 x 24 x 24 inches; fit and use require verification.

A listed 110-gallon capacity makes the Dee Zee DZ91753 a choice for truck owners prioritizing substantial liquid storage. Its Brite-Tread aluminum construction, radius-curve design, and mounting tabs add practical details for bed installation and tank structure, while its 48-by-24-by-24-inch dimensions demand significant truck-bed space.

The radius-curve design is stated to eliminate key weld pressure points, and the heavy-gauge Brite-Tread aluminum construction provides the specified tank material and form. Mounting tabs help secure the tank to a truck bed; a venting coupler and cap are included for venting and closure. Dee Zee describes these transfer tanks as carrying non-flammable liquids, so the product information does not support treating it as a gasoline auxiliary tank. Plan around its large dimensions and liquid-use boundary.

Skip it if you need gasoline auxiliary fueling; RDS 70326 describes gasoline use by top siphoning with an electric fuel pump.

This Dee Zee fits truck owners seeking very large-volume transport of non-flammable liquids and bed-mounted security. Its 48-by-24-by-24-inch size and stated liquid-use boundary make it unsuitable for buyers seeking a compact gasoline auxiliary setup.

Listed on Amazon as: Dee Zee DZ91753 (106 gallon) Rectangle Transfer Tank – Aluminum

#8

8. Dee Zee 91753X Aux Tank

• Capacity: 110 gallons
• Compatible with Vehicle Type: Truck

Best for: Large-volume truck tank buyers.

Why it ranks #8: Dee Zee lists 110-gallon capacity and truck compatibility, but the supplied details offer limited dimensions and installation information for pickup fit assessment.

The Dee Zee 91753X lists 110 gallons of capacity, making volume its clearest point of distinction for truck owners transporting substantial quantities of liquid. Its product information identifies truck compatibility, but provides little installation detail, so buyers will need to assess the tank’s physical fit and intended liquid application before choosing it.

The 110-gallon specification indicates a large storage role, useful to buyers whose primary requirement is substantial onboard volume. Truck compatibility is listed, but dimensions and mounting details are not supplied in the product facts, limiting what can be established about bed layout or installation planning. Dee Zee’s broader description characterizes its transfer tanks as carrying non-flammable liquids; buyers should therefore not infer gasoline auxiliary fueling from this listing’s capacity or the word “Aux” in its title.

Skip it if you need stated dimensions and bed mounting tabs; Dee Zee DZ91753 lists 48 by 24 by 24 inches and mounting tabs.

This Dee Zee merits consideration by truck owners prioritizing a listed 110-gallon tank for non-flammable liquid transport. The missing dimensions and mounting information leave bed fit and installation planning unresolved, so those details are a significant boundary.

Listed on Amazon as: DEE ZEE 91753X Aux Tank, 110 Gallon

#9

9. Aluminum Tank Industries AUX46R

• Capacity: 46 gallons
• Material: Aluminum
• dimensions: 62 x 20 x 14 in
• Compatible with Vehicle Type: Motorcycle, Powersports Vehicles

Best for: Powersports fuel capacity.

Why it ranks #9: The 46-gallon aluminum tank offers substantial capacity, but its listed compatible vehicles are motorcycles and powersports vehicles rather than pickups.

The 46-gallon capacity is the central feature of Aluminum Tank Industries’ AUX46R, an aluminum auxiliary gas tank with listed dimensions of 62 by 20 by 14 inches. Its specifications identify motorcycle and powersports vehicles, so pickup buyers should treat that compatibility information—not the broad auxiliary-tank name—as the key application boundary.

The aluminum material and 46-gallon capacity provide the supplied basis for considering this tank as added fuel storage, while the 62-inch length and 20-inch width affect where it can be placed. The specifications list motorcycle and powersports vehicles rather than trucks, so the product information does not establish pickup compatibility. Buyers should also note that the additional description conflicts on material, calling it stainless steel, whereas the title and specifications say aluminum.

Skip it if you need a documented truck application; RDS 71212 lists truck compatibility and a 60-gallon capacity.

The AUX46R may suit buyers whose application aligns with its listed motorcycle and powersports compatibility and who want 46 gallons. Pickup owners should not infer truck fit from the auxiliary-tank label alone, especially given the listed vehicle categories.

Listed on Amazon as: AUX46R Auxiliary Gas Tank – 46 Gallon Capacity

#10

10. dreamdragon 45-Gallon Reservoir

• Capacity: 45 gallons
• Material: Aluminum
• Compatible with Vehicle Type: Truck

Best for: Hydraulic-reservoir buyers.

Why it ranks #10: Although the listing calls it an auxiliary fuel tank, its description identifies an upright hydraulic oil reservoir, making it a poor match for pickup fuel storage.

The 45-gallon capacity is paired with an upright, rectangular aluminum reservoir, offering substantial fluid storage in a form identified as a hydraulic tank. Its listing also calls it an auxiliary or transfer fuel tank, but the hydraulic-reservoir description makes intended fluid use an essential point to resolve before a pickup owner considers it for fuel.

The aluminum construction is described as corrosion-resistant and heat-dissipating, benefits relevant to the listed hydraulic-reservoir role and intensive operating scenarios. An installation kit is also stated, potentially simplifying setup compared with sourcing every installation component separately. However, the supplied information identifies the product both as a hydraulic oil reservoir and as an auxiliary/transfer fuel tank. That ambiguity matters: buyers should not assume a fuel application from capacity or shape alone.

Skip it if you need a clearly described pickup diesel connection; RDS 71804 specifies a vehicle-tank connection and diesel gravity feed.

Consider it only if your application matches the listed upright hydraulic-reservoir role and you can establish the intended fluid use. The 45-gallon capacity and installation kit are useful details, but the fuel-versus-hydraulic description needs resolving.

Listed on Amazon as: 45 Gallon Rectangular Auxiliary Fuel Tank