There are a lot of intellegent people making comment and a lot to be learned on this board. My first comment was not to be against an on board compressor. I have one in my bay along with toolbox and other things. It is important to air a tire, the usual high pressure air needs not to forget bus air failure this could be patched to get you unstranded, not to mention air a float or bicycle tire for the grandkidsI just wonder the need of puting in a permanent system involving wiring air plumbing and all that goes with it.. If I thought I could air my bus up every day or 2 and keep air bags up and make a MCI sit levelI'd jump on it. too.