Ii have a B+ which seems to have less outside storage than a C. I found a compressor at Harbor Freight that is small and gets it's power from a DC battery. I checked it and the cables are long enough to reach from my coach batteries to all tires. I plan to use it only when tires need air and i am at a campsite. I don't know the name of it as it is in my MH which is in storage. I have never had to use it yet, so I don't know how long it would take to fill a tire. Since I only plan to use it in emergencies, I don't mind if it takes an extra 10 minutes to top off a tire. It is small enough to fit under my dinette seat. Before a trip, i use a bigger compressor in my garage.