TITAN’s Spare Tire Auxiliary Fuel System puts an additional 30 gallons of fuel in the space commonly used to stow a vehicle’s spare tire. Due to its underbody location, it has no impact on the truck bed’s hauling space. The new system comes with a universal filler kit featuring a brushed aluminum door that can be installed on the vehicle’s exterior sidewall or on an inside wall of the truck bed. All of the mounting brackets, hoses, valves, and transfer pump with controller are included with each system.