350 Gal Imp Pickup Truck Water Tank Designed to fit full-size pickups, the various sizes have low profiles for better rear vision. They feature offset fill openings for safety and easy access. The 185 imperial gallon size fits both full-sized pick up models. The tough circular design, along with rotationally molded polyethylene adds strength and durability. Our Norwesco tanks are made out of rotationally molded linear, high-density polyethylene resin that provides outstanding environmental stress crack resistance. The resin is UV stabilized.