I've only had my FJ out a couple of times on the rocks, the first time we aired down and the second we were at normal pressures. There was no doubt how much performance was left on the table by NOT airing down after today. I know this is a "no duh" thing for experienced wheelers, but I had no real idea how much loss in performance I was going to see. Not to mention the additional wear on the parts from having to muscle up a rock when 20psi less in your tires would have allowed a graceful ascent.
Anyway, I did a bit of research and ordered this air compressor and deflator.
Tsunami MV-50

Currie EZ Deflator
