Increase driving range with an auxiliary fuel tank with toolbox built in! Auxiliary tanks can be used as additional capacity for a factory tank with the use of an RDS diesel install kit. Shop for better fuel prices with this increased range. Each tank comes with fuel cap, drain fitting, manual sight gauge, fuel filler shroud, along with baffles to reduce sloshing. Toolboxes come with linked stainless-steel locks that also secure fuel fill to prevent tampering, and two lift cylinders to hold open a crowned lid. All tanks Meet DOT standards. Diesel install kits are also available (sku #s 243102099, 243102299 and 243102199 sold separately). Not intended to be used for gasoline. Made in U.S.A. RDS diesel install kits also available for diesel gravity feed sku 243102099, 243102299 and 243102199.