What year is your coach? The newer it is the more air systems you have, which are more possibilities for leaks.
The other day I noticed my air compressor running longer than usual. Well I had been working on my entry steps and had the ignition on so I could operate the steps in and out. I also had the dash vent on. My 8v92 doesn't have "engine vacuum" to operate the dash air system instead it has a tiny air tank that bleeds off air to create a vacuum to operate the system. Yep, that's where I was losing air. Turned off the vent and no loss.
One place it could be leaking down is on your 6-pack solenoids for the leveling system, either in front or back. I had 1 solenoid leaking a couple years ago and had to replace the o-ring.
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