I purchased a very expensive under bed tank and lost 200$ in the deal after paying a restocking fee because it was for a 1/2 t and way to wide. It was 8 inches wider than the 3/4 frame and there was nothing I could do about it. I'm 6 years into a re store, slowly but surely. I've got the chassis done and updated. Cab painted, front clip painted, engine, transmission are new and in. Now I'm working on hooking up accessories to the engine to make it run. So I need fuel. I want to use an u dear bed type of tank in behind the rear axle any help would be great.