[rheavn]

If your 12V air system holds pressure, then your slide seals will inflate.  Staying inflated has to do with whether or not the system has air leaks.  The original shut off valves for each slide seal are notorious for leaking.   With the 110V air compressor shut off and the main air system with no air, activate your 12V compressor and let it fill until it shuts off.  Now note how long it takes to turn back on.  This will give you your first indication of whether the 12V air system has leaks.  In the above condition, my 12V compressor runs once a day.