Hands down the best air compressor I have ever used. I have had others and they didn’t last very long or feel as solid as Thor’s. Air up or down quickly. Shipping was quick and well packaged.
This is a perfect compressor for a UTV. It is compact and comes with a case. Case can be mounted on a Molle rack.
Thor's Lightning Portable TotalControl 12v True Dual Air Compressor 10.6 CFM
I've used it several times and works great! Deflation is fast and so is inflation. I don't have large tires on my Bronco but it inflates them in less than 5 minutes from 10 psi to 40. The only issue is the pressure counter on the compressor doesn't match the vehicle's measurement. It's off by about 4 psi. But that's a minor issue of your looking for reliable air ups. I can't imagine if altitude affects that but I'm usually at 10k feet or more.