OK, now that I have my Alligator valve stem caps in place, I went out and purchased a Porter Cable, pancake, 6 gallon, 150 PSI, 120 volt air compressor.
I purchased a long air chuck, mounted a "T", a round 200 PSI pressure gauge, and the nozzle fitting, this way I can monitor the line pressure.
One of my storage compartments on the driver side has a 120 volt outlet installed in it, so I put the unit there. This compartment has a small square tunnel over to the compartment on the other side. Since this compressor has two outlets, I attached the included black 25 foot hose and left it in the driver side compartment to service the tires on that side. I then routed a blue 50 foot hose I already had through the tunnel over to the other side to reach the tires on that side.
Now, I just need to turn it on, break out the gauge, air chuck and I'm in business!
The unit reaches 150 PSI in two minutes and 30 seconds from empty. No leaks. It held dead on 150 all night. I ran it full, turned it off and left it in the den.
I'm running 80 PSI in my 19.5" tires and as long as the line has over 110 PSI, it inflates them very easy. If the unit is running, it almost keeps up while I inflate. I purchased the unit at Lowe's and got the extended warranty just in case. This unit will live in the coach and may be used for other things, but its primary use is to keep the RV tires topped off.
I plan on getting a TPMS soon, and this will just add to that. I love that feeling of security, one less thing to worry about!