Maybe I am not reading the problem correctly, but why would the cab be in a different position while parked than while driving? Is there some need to release the air once you are parked? My experience with air bags and air controls (not on a cab air bag) is that properly installed leak free, they really don't lose air over time so the cab should stay right where you left it while driving. So, making that assumption just leave it aired up and set the opening accordingly and there should be no misalignment issues under other conditions.
When we did lowrider air suspensions here in our shop, the bags would stay aired up indefinitely assuming the correct leak free installation. Same story on the air bags on my trailer saver air ride hitch, it has 5000# of trailer pin weight sitting on it and it never loses any air at all, sitting for weeks at a time between trips.
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