this is a AA SWB flatbed truck. There is a 3" X 6" piece of wood fitted to the top of the frame rail, which the tank is fitted to. The flatbed frame sits on top of the wood which gives about a 6" space, which is necessary to clear the DRWs. The inlet is between the cross pieces of the flatbed, this way there is no hole in the bed or the frame rail. If you didn't know it was there you might not see it. I also put a small screw through the gas cap in the original location so someone uninformed doesn't try to fill the original tank up.