A system and attendant assembly for incorporating at least one alternate fuel supply, such as of the type used in combination with a conventional distillate fuel, to power a heavy duty industrial vehicle, such as a mine haul dump truck. The system and attendant assembly includes a mounting assembly structured for containment and support of a primary fuel tank and an auxiliary fuel tank. The mounting assembly is disposed on a mounting area laterally adjacent between the two tires on a side of the truck, wherein the mounting assembly and mounting area are cooperatively disposed and structured to facilitate storage of the alternate fuel and operative communication and distribution thereof with the powering operations of the vehicle.