on the body lift i used 2x2x3 box tubing, and both the rubber spacers on top of it, and it came out to be about three and a quarter, and i lifted the gas tank just over three inches so the bubble on top of the tank wouldnt hit the body. for my tank lift, i cut out the rear two crossmembers and welded in new ones, and welded on brackets in the rear and welded bolts on the front crossmember. both the crossmembers were rusty and PURPLE along with the rest of the tracker until it got fully bedlinered. the internal gas tank is a good idea, but if you have a body lift you can raise the tank enough and then you keep your center of gravity lower and have more room inside for storage.