Great post Jon.. On my CC, I added a gauge for the aux tank so I could see any loss of air. As the air in the aux tank bleads off, you know you have a leak somewhere. The gauge also helped in determining if I had enough air in the aux with the engine off to raise a bag for leveling, as the 12v compressors didn't have enough volume to pump up a bag. On my Marathon, there is no 12/24v pump, so if you don't have any aux air, the only way to level is starting the engine.

I believe some of the conversions have an aux gauge and I'm going to add one. The idea of carring a 120v pancake compressor as someone else mentioned is a good thought for always having an aux air source, but you really shouldn't need it if your leak free..

I had a problem with the front air bags loosing air when I got the bus, but it hasn't happen again and the bus is dead level after sitting for a week leaving the level low in the drive position. I may have a leak somewhere when leaving the valve in a position other then drive and it maybe at the valve itself.

Now it's time to press some idler pully bearings.....