[rheavn]

IF you have a 12V air compressor AND your check valve at the supply tank in the RR wheel well is working, then your slide seal will stay up for weeks if the 12V air system is leak free.  Leaks in the system outside the 12V air system will run the main supply pressure to zero, but a functioning check valve will stop the leakage at 60 lbs in the 12V air system.  If the 12V air system continues to leak down, then you have a leak in the 12V air system which consists of the supply tank in the RR wheel well, pocket doors, toilet(s), slide seals or air lines & fittings within the system.