I do have an HWH hydraulic/air leveling system in my coach. I like the idea of an independent air compressor as suggested in the earlier post. When I park and level the coach, I dump the air bags and then level with the hydraulic. If I use the compressor now while parked, I start the engine, leaving the hydraulic jacks down. When finished with the need for air, I turn the engine off and dump the air bags and the coach settles down on the already extended hydraulic jacks. It does return to the same level as before. I was just hoping I could avoid the up and down part of that process. I like the idea of an independent compressor as suggested in the earlier post. Thanks to all for the input.