Hey guys! I am puttin the shaffer coil kit and toy axles under my rig pretty soon(when the kit arrives), but I dont know how far back I will be able to move the rear axle before I will need to move the gas tank that is unless I wont be coming in contact with it, but I dont plan on being that high. Anybody know how far I can move the axle back? Should I move the gas tank inside the bed? thanks!