I just got through layin out my truck I put 1/2" paker valves on the up and 3/8" smc valves on the down I almost have it done its layin on the transmission crossmember I have a 8" notch in the back which is bridged with the bags on the axle and I have a four link on it. I put a 450 viair in the back with a 12gal custom painted tank I got for xmas. I put my gas tank in the rear I need to get a fuel cell and a cover. With the interior it is factory match with my paint I add a flex agent to the vinyl and so far so good no problems. check it out and tell me what you think this was my christmas present to myself.