Incidentally, it takes a LOT of air to fill those air bags. I don't typically find that I notice any movement, in an upward direction with less than about 75 psi supply pressure and not much with less than about 90 psi. The HWH manual recommends that you leave the engine running (I find that high idle works best) when leveling the coach. I can drop the supply air pressure down 20 psi in less than 10 seconds trying to raise a side or front or rear manually with the engine off and the pressure up above 100 psi.
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