I carry a Viair. I use it about 10x per year. I've had it about 5 years. I don't technically air down for off roading. However, I air down the truck when not pulling the trailer to get a better ride. No trailer 60-65 lbs, with trailer 80lbs. Trailer tires are 80lbs. Tire size as well as pressure matters when researching air compressors. Also, how long can you run it before you have to let it cool down?
Longer hose would be nice as I have to stretch from the truck batteries to the tires.
Just checked, I have the ViAir 400P, purchased Feb, 2012. It has served me well.
