[Fulltiming]

The air bags should stay up for an extended period, at least mine do. For much of the air operated items 40 psi would be sufficient but I find that without 75-80 psi, raising my coach is tediously slow. If your air bags are deflating I would probably try to track down the leak. Otherwise, I would likely set the external air at 80 psi which is about the middle of the range for the 120 volt air compressor. Mine is 75-95 psi but I understand that many are 70-90 psi. I don't think that anything between about 75 and 120 would be an issue since that is where the engine air compressor and the 120 volt air compressor keep the system.