Air Zenith – Air Suspensions
air-zenith.com
I had one of these on my dodge for 15 years. It lived between the frame rail and the floor of the bed. So kinda shielded but basically full exposure to the elements.
It's a beast. 5 gallon tank from empty to 145 psi in like 3.5 minutes. It would run a 1/2 air impact gun if you wanted.
You could feel it vibrant the truck when it ran.
Water finally killed it. But after so many years, I can't complain. I'll definitely get another.