that does not sound right at all. i would bet your leaf-springs are bad. is it the rear jacks or all of them that are close? can you get some photos of the clearance + leaf spring section + inside of each wheel? is it more on one side(slide-out side) than the other? many times the leaf spring damage occurs from people leaving the moho sit with the slider out and no jack support - this'll trash the leaf springs on the slider side.
like AUTO said, airbags could help you out a bit but your situation sounds pretty drastic. i would probably look into leaf springs if that truly is your problem rather than band-aiding with airbags.
1999 Fleetwood Pace Arrow 2000 Fleetwood Pace Arrow