Best Aux Fuel Tank For Pickup: 10 Options Compared

#1 · Best Overall

1. DEE ZEE DZ92556NB

• Capacity: 40 gallons
• Material: Aluminum
• Weight: 60 lb

Best for: Aluminum tank bed-haul users.

Why it ranks #1: Its 40-gallon aluminum tank measures 59 by 22 by 10 inches and lists mounting tabs, three baffles, a drain plug, and installation hardware.

A 40-gallon capacity in Brite-Tread aluminum gives this Dee Zee transfer tank a combination of practical reserve volume and non-rusting construction. Three stability baffles help manage movement in transit, while the radius-curve design addresses weld pressure points. Mounting tabs are included to secure the tank to a truck bed.

The 59-by-22-by-10-inch dimensions help buyers assess how the 40-gallon tank could fit into a pickup-bed layout. Its aluminum construction is described as non-rusting, while a black powder-coat finish and Brite-Tread surface are specified. Three stability baffles address movement of contents, and the radius curve is intended to eliminate key weld pressure points. The drain plug supports draining, while the lockable cap and venting coupler are additional listed components for handling the tank.

Skip it if you need more capacity and a fuel gauge connection; the Landrol 58 Gallon Aluminum Fuel Cell lists 58 gallons and a sending unit.

This Dee Zee suits pickup owners seeking an aluminum tank for non-flammable liquids with baffles and bed-mounting tabs. Check the 59-by-22-by-10-inch footprint and 40-gallon capacity against your cargo and reserve needs.

Listed on Amazon as: DEE ZEE DZ92556NB Transfer Tank

#2 · Welded Aluminum

2. RDS 71083

• Capacity: 45 gallons
• Material: Aluminum
• Weight: 42 lb

Best for: Rust-resistant 45-gallon tank users.

Why it ranks #2: This 45-gallon aluminum tank has fully welded seams and is described as an auxiliary/transfer model, a useful combination for pickup fuel transport.

Fully welded seams and an aluminum tank construction distinguish this 45-gallon RDS model for buyers seeking a rust-resistant auxiliary or transfer tank. Its listed capacity offers more reserve than a 37-gallon option, while RDS specifies that gasoline auxiliary fueling is allowed when fuel is siphoned from the top with an electric fuel pump.

The 45-gallon capacity provides a clear storage figure, and aluminum is specifically described as not rusting. Fully welded seams are listed for durability, a relevant construction detail for a tank used to transport fuel. RDS describes auxiliary tanks as connecting to a vehicle’s fuel tank; its general information says diesel can gravity-feed from the bottom. Gasoline auxiliary fueling instead requires top siphoning with an electric fuel pump, so buyers should plan around that specified method.

Skip it if you need a defined 50-by-20-by-9-inch footprint; the RDS MFG INC 71804 lists those dimensions and holds 37 gallons.

Pickup owners wanting 45 gallons in a welded aluminum auxiliary or transfer tank may find this RDS suitable. Its supplied listing does not give tank dimensions, so buyers should resolve bed-space planning before committing to this capacity.

Listed on Amazon as: RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank – 45 Gallon Capacity

#3 · Steel Construction

3. DEE ZEE DZ92556NSB

• Capacity: 128 liters
• Material: Alloy Steel
• Weight: 70 lb

Best for: Steel-tank bed-haul users.

Why it ranks #3: The 42-gallon steel tank lists five stability baffles, a drain plug, mounting tabs, and a 59.5-inch width for truck-bed installation.

Five stability baffles give this 42-gallon Dee Zee steel transfer tank a practical edge for carrying non-flammable liquids in a pickup bed: they help stabilize contents while traveling. Its 14-gauge steel construction and radius-curve design target strength at the tank’s weld pressure points, with mounting tabs for securing it to the truck bed.

The 59.5-inch width and 19-inch height give buyers specific dimensions to compare with their available bed space before planning installation. Five stability baffles address movement of the load, while the radius curve is intended to eliminate key weld pressure points. A drain plug supports draining the tank, and the lockable cap adds a way to secure its opening. The black NRT rust-inhibitor powder coat protects the steel surface; this is a 42-gallon tank for non-flammable liquids.

Skip it if you need aluminum construction; the DEE ZEE DZ92556NB offers a 40-gallon Brite-Tread aluminum tank with similar bed-mounting tabs.

For pickup owners who want a steel tank for transporting non-flammable liquids, this Dee Zee combines 42-gallon capacity with baffles and mounting tabs. Check its 59.5-inch width and 19-inch height against the bed space available.

Listed on Amazon as: Dee Zee DZ92556NSB Transfer Tank

#4 · Low-Profile Design

4. RDS 71804

• Capacity: 37 gallons
• Material: Aluminum
• Weight: 77 lb

Best for: Compact auxiliary-tank users.

Why it ranks #4: Its 37-gallon aluminum tank measures 50 by 20 by 9 inches, giving pickup owners a lower listed height than the larger options.

At 50 by 20 by 9 inches, the RDS 71804 has a defined, relatively shallow listed profile for buyers planning a pickup-bed auxiliary tank. Its 37-gallon aluminum construction offers a specified reserve capacity, and RDS states that gasoline auxiliary fueling is allowed when siphoned from the top using an electric fuel pump.

The 37-gallon capacity gives buyers a clear reserve-size figure, while the 50-by-20-by-9-inch dimensions support bed-layout planning. Aluminum is the listed material, and the product is identified as an auxiliary fuel tank. RDS says its auxiliary tanks connect to a vehicle’s fuel tank and that diesel can gravity-feed from the bottom; an optional diesel install kit is mentioned. For gasoline auxiliary fueling, the stated method is top siphoning with an electric fuel pump, which buyers should account for in their setup.

Skip it if you need a larger reserve; the RDS MFG INC 71083 offers 45 gallons in an aluminum tank.

This RDS is for buyers seeking a 37-gallon aluminum auxiliary tank with a 9-inch listed height. Check its 50-by-20-inch footprint and the specified gasoline siphoning method against your bed layout and fueling plan.

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

#5 · Toolbox Combo

5. RDS 72548 Combo

• Capacity: 60 gallons
• Material: Alloy Steel, Aluminum, Stainless Steel
• Weight: 16 oz

Best for: Storage-and-toolbox combo buyers.

Why it ranks #5: This 60-gallon transfer tank/toolbox combo is listed for trucks and measures 55 by 20 by 19.5 inches, combining storage functions.

A 60-gallon capacity paired with a toolbox makes the RDS 72548 a two-purpose bed option for truck owners storing fuel alongside gear. Its listed dimensions are 55 by 20 by 19.5 inches, so buyers can assess the footprint as well as the space the combo may occupy before planning a bed layout.

The toolbox-and-tank combination brings storage and a 60-gallon fuel tank into one truck-bed unit, a useful arrangement for buyers who want those functions together. Its 55-by-20-by-19.5-inch dimensions help with bed-space planning, and the listing identifies it as compatible with trucks. RDS describes auxiliary tanks as connecting to a vehicle’s fuel tank; diesel can gravity-feed from the bottom, and an optional diesel install kit is mentioned. The supplied information does not specify the toolbox’s internal layout.

Skip it if you want a specified rectangular aluminum tank instead of a toolbox combo; the RDS MFG INC 71083 is a 45-gallon aluminum model.

Truck owners who need fuel capacity and toolbox storage in one bed unit may prefer this RDS combo. Its 55-by-20-by-19.5-inch dimensions and unspecified toolbox layout are important boundaries when planning cargo space.

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

#6

6. RDS 70326

• Capacity: 69 gallons
• Material: Aluminum
• Weight: 16 oz

Best for: High-capacity auxiliary-fueling users.

Why it ranks #6: Its 69-gallon aluminum capacity is the largest listed, and the description says diesel can gravity-feed from the tank bottom.

A 69-gallon capacity sets this rectangular RDS aluminum tank apart for pickup owners seeking substantial auxiliary fuel storage. Its listed dimensions—57 by 18 by 16 inches—give buyers concrete measurements for bed-space planning. RDS states that gasoline auxiliary fueling is allowed when fuel is siphoned from the top using an electric fuel pump.

The aluminum construction and 69-gallon capacity suit buyers prioritizing a large auxiliary supply, while the 57-by-18-by-16-inch dimensions let them check the tank against available truck-bed space. RDS describes its auxiliary tanks as connecting to a vehicle’s fuel tank; diesel can gravity-feed from the bottom, and an optional diesel install kit is mentioned. Gasoline use has a different stated method: siphoning from the top with an electric fuel pump. That distinction matters when planning the fueling setup.

Skip it if you need a smaller 37-gallon tank; the RDS MFG INC 71804 is listed at 50 by 20 by 9 inches.

This RDS suits buyers who need high-capacity auxiliary storage and can accommodate its 57-by-18-by-16-inch footprint. Review the specified gasoline siphoning method or diesel-feed arrangement before choosing how it will connect to your vehicle.

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

#7

7. RDS 71783 Wedge

• Capacity: 63 gallons
• Material: Aluminum
• Weight: 61 lb

Best for: Wedge-tank high-capacity users.

Why it ranks #7: The 63-gallon aluminum wedge tank is listed for cars, trucks, and vans and measures 52 by 19 by 18 inches.

A wedge shape and 63-gallon capacity make the RDS 71783 a high-volume auxiliary tank option for buyers assessing a pickup-bed layout. Its listed 52-by-19-by-18-inch dimensions provide concrete planning figures, and its aluminum construction keeps the material choice distinct from steel tank options.

The wedge profile distinguishes this tank from rectangular models, while its 63-gallon capacity gives buyers a substantial auxiliary reserve. The 52-by-19-by-18-inch dimensions help determine whether the shape and volume suit the available bed space. RDS describes its auxiliary tanks as connecting to a vehicle’s fuel tank, with diesel able to gravity-feed from the bottom; an optional diesel install kit is mentioned in the supplied information. The listing identifies compatibility with cars, trucks, and vans, though it does not specify a particular pickup-bed fit.

Skip it if you need only 20 gallons; the RDS Aluminum 74551 is a rectangular auxiliary tank listed at that capacity.

This RDS suits buyers seeking a large aluminum auxiliary tank and able to use its wedge profile. Compare its 52-by-19-by-18-inch dimensions with the pickup bed, since the listing does not identify a specific bed fit.

Listed on Amazon as: RDS MFG INC 71783 Auxiliary Fuel Tank 63Gal Wedge

#8

8. Better Built 29211584

• Capacity: 36 gallons
• Material: Alloy Steel
• Weight: 40 lb

Best for: Spill-conscious steel-tank users.

Why it ranks #8: This 36-gallon steel tank includes a vented lockable cap and mounting kit with rubber bushings, though its listed dimensions are limited.

An overfill restriction that automatically shuts off the pump helps make the Better Built 36-gallon steel tank a considered choice for buyers concerned about fueling spills. Its baffles help strengthen the tank and limit shifting contents in transit, while a flush-mounted inlet and outlet support fast flow during transfer.

The automatic overfill restriction addresses pump shutoff to help prevent spills, while the built-in baffles add strength and help keep contents from shifting during transport. Two-inch-diameter flush-mounted inlet and outlet bungs are specified for fast flow, and the vented lockable cap combines venting with a locking closure. At 36 gallons, this steel tank provides a smaller capacity than the 69-gallon RDS MFG INC Rectangular Auxiliary Fuel Tank, a relevant distinction for buyers weighing capacity against these handling features.

Skip it if you need more than 36 gallons; the RDS MFG INC Rectangular Auxiliary Fuel Tank holds 69 gallons.

Pickup owners prioritizing overfill control and baffles in a steel transfer tank should consider this Better Built model. Its 36-gallon capacity and 11-inch-wide, 17-inch-high listed dimensions remain key limits for bed planning.

Listed on Amazon as: Better Built Steel Transfer Fuel Tank – 36-Gallon, Rectangular, Black, Model Number 29211584

#9

9. RDS 74551

• Capacity: 20 gallons
• Material: Aluminum
• Weight: 80 lb

Best for: Compact diesel-transfer users.

Why it ranks #9: The 20-gallon aluminum tank has fully welded seams and heavy-duty mounting brackets, but its lower capacity limits added range.

A 20-gallon capacity and 50-by-21-by-7-inch dimensions give the RDS 74551 a low-profile, compact format for pickup owners transferring diesel or other non-flammable liquids. Its aluminum construction and heavy-duty mounting brackets support the stated truck-bed use, while fully welded seams are listed for durability.

RDS describes this tank as intended to transfer diesel and other non-flammable liquids from a pickup bed to remote or heavy equipment. The 20-gallon capacity and 50-by-21-by-7-inch dimensions help buyers plan a smaller reserve and compare the footprint with available bed space. Fully welded seams and heavy-duty aluminum mounting brackets are specified construction and installation details. The description also says the unit combines a transfer tank with a storage box on top, so buyers can consider that combined format when arranging bed cargo.

Skip it if you need a larger auxiliary reserve; the RDS MFG INC 71783 Wedge holds 63 gallons.

Pickup owners transferring diesel or other non-flammable liquids to remote or heavy equipment may value this RDS’s low-profile dimensions and mounting brackets. Its 20-gallon capacity is the boundary for buyers planning longer supply needs.

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

#10

10. Landrol 58-Gallon Tank

• Capacity: 58 gallons
• Material: Aluminum

Best for: Gauge-visible aluminum tank users.

Why it ranks #10: Its 58-gallon aluminum capacity and included straps suit transport, but the seller states the tank has not been DOT certified.

A sending unit that connects to a fuel gauge gives this 58-gallon Landrol aluminum tank a useful monitoring feature for buyers who want to check remaining capacity. Its 59-by-13-by-17-inch dimensions provide a defined footprint, while included oil pipes and vent covers form part of its listed equipment.

The sending unit connects to a fuel gauge to facilitate checking remaining capacity, addressing a practical monitoring task during use. At 58 gallons, the tank offers substantial storage, and its 59-by-13-by-17-inch size lets buyers evaluate bed-space needs. Aluminum is described as easy to clean, while manually welded joints and reinforcing covers are specified for strength. Fully welded mounting brackets support installation on a truck, and two straps make removal from the vehicle more convenient. The listing states the tank is not DOT-certified.

Skip it if you require a DOT-certified tank; this Landrol model is explicitly listed as not certified.

Truck owners needing 58 gallons of aluminum storage and a fuel-gauge connection may find this Landrol’s monitoring features useful. Its stated lack of DOT certification is a firm boundary, alongside the 59-inch length to assess.

Listed on Amazon as: 58 Gallon Aluminum Fuel Cell Tank Rectangular Transfer Fuel Tank Auxiliary Diesel Storage for Transportation Truck