Viair 12 volt portable air compressor

Viar is probably the best 12V portable compressor you will get. With that being said, another option is the Slime brand from Wal-Mart. I bought the best one they had a few years ago to keep in my jeep for off road trips. It will pump up my 35" tires from 6psi to 30psi in just a few minutes time. I love it and it was only like $54 and comes with a nice durable bag. I also have my 120V compressor in the basement of the 5er. As stated before you will become the hit with the kids at the park. They always have bike tires and basketballs to be pumped up.

Another option is to just put in a power converter or inverter what ever one goes from 12V to 120V and just run your 120V off the battery after you get hooked up of coarse. :)