We got a small portable, light-weight compressor at Habor Freight. I know Harbor Freight sends shudders through some people, and it's definitely not a high-end compressor (about $75 if I remember right) but it does a great job for what we need it for...topping off tires and keeping everything inflated... By the time it dies I will have got my money's worth out of it. It uses the 12v
clamps to the battery on the truck or the trailer and I can reach all tries from the same place (with a Bambi). I didn't want one that uses the 12v
plug-in. The nice thing about Harbor Frieght is that if you get the inexpensive warranty you can replace it if anything does go wrong, no questions asked.