Ok, first my question, is it ok for the bus to sit (month at a stretch) on the ground, or is it bad?

The reason I ask is my bus will slowly sit (pretty evenly) over a week or so, a little quicker in the front. I don't know if I have a leak, or if the aux air doesn't have enough umph to keep it up. If it's not detromental to my bus' health, it doesn't bother me, easier for the wife to step up into if it's lower. However if you guys recomend, I'd run the engine once a week to bring the level back up to full height. If it doesn't matter either way, I'd just put her on the ground.

Any suggestions?

Geoff