Skip to content
Flat Rate Shipping On All Products* - Sale Ends 6/29 @ Midnight
Flat Rate Shipping On All Products - Sale Ends 6/29 @ Midnight

Customer Reviews

Based on 2 reviews
Tom Michalski
Happy on All Sides

The fuel tank is exactly as described. Elite shipped it promptly (faster than expected) and it arrived on a pallet and in perfect condition.

F250 install

The tank arrived in good shape and ahead of schedule. The only thing I could see to improve on would be to relocate the mounting brackets as they fall right over the bed mounting bolts and frame rails.

RDS 40 Gallon Aluminum Auxiliary Fuel Tank 60X20.5X9 Model # 70387

by RDS
Original price $1,164.99
Original price $1,164.99 - Original price $1,164.99
Original price $1,164.99
Current price $989.95
$989.95 - $989.95
Current price $989.95
RDS 40 Gallon Aluminum Auxiliary Fuel Tank 60X20.5X9 Model # 70387


The RDS auxiliary fuel tank is designed to feed the main fuel tank of your truck to increase driving range. Long distance drivers all over the world love the RDS auxiliary tank because it allows you to travel further with less stops, save money by purchasing fuel where it is cheaper, and avoid having to navigate a large load into a tight gas station.

The RDS auxiliary fuel tank will mount securely in the back of your truck and then can be connected to your factory fuel system using the RDS gravity feed diesel kit (Not Included). 

This auxiliary fuel tank comes with a lockable fuel cap, drain fitting, withdraw and return fittings, safety vent, sending unit mounting location, and internal baffles to reduce sloshing. All RDS tanks meet DOT standards and are proudly made in the USA.

Elite Truck Boxes is well known for being one of the best places to purchase an auxiliary fuel tank simply because we offer the best prices and we can get the tank shipped to you without it being damaged.  

It is the user’s responsibility to comply with local, state and federal requirements pertaining to safe transportation, loading and discharging of tank contents.


  • Heavy duty mounting tabs allows the tank to be securely mounted to your truck
  • 100% pressure tested by the manufacturer for safety
  • Fully welded seams make for a very strong design and eliminate the chance of a leak
  • Rust-resistant aluminum construction will not rust or corrode 


    Material: Aluminum
    Finish: Bright Aluminum
    Gallons: 40 
    Length: 60" 
    Width: 20.5" (21.5 w/ tabs)
    Height: 9" 
    Notch Length: 1.5" 
    Notch Height: 4"