Since I have a generator and easy access to AC power, in the rear cargo bay, I went with the Sears Craftsman 1.2 Gallon AirBoss™ Oil-Free Air Compressor Here
. I can use it for other things around the house as well as in the motor home.
One thing to keep in mind with any
compressor is it is better to add air hose than use an extension cord. Extension cords may cause a voltage drop, in both AC and DC powered units, reducing their capability. Adding air hose doesn't have a negative impact...and it is a lot cheaper!