Hello, my truck is a 1937 project truck that someone had started but could not finish. The previous owner had a Rock Valley custon aluminum tank made and installed it under the bed just behind the rear axle with the filler on top with access through the wood bed. This is a nice set up. However, it did'nt leave enough room for the exhaust. So my exhaust exits in fron of the rear tires. So, keep this in mind with a tank under the bed.