[mgchevyparts]

Got under the truck and measured, I have 16"x39" available for a gas tank. Looking at the Doc's measurements there's no problem mounting a tank under there without relocating any cross member. Relocating my air tank to the drivers side should be easy also as the PO installed the exhaust with a cross over and a single exit out the pass side running board area, so the drivers side between frame and drivetrain is pretty wide open. I just have to look at all the different vendors and decide best price/quality etc.