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If you're going to have the means to air your tires down on the trail, you might as well have something that you can air back up with as well. When I first started to hit the trails, I never aired down because I never wanted to have to search for a service station after I was done or didn't want to have to drive on lower tire pressure getting there. Wherever there was. Now, I don't have to worry about that, and I can ride the trails in a first-class soft ride, and put less wear on the truck at the same time. This Extreme Outback ExtremeAire unit did the trick for me.
I suppose you want to hear real-world results to justify my purchase now. Well, it doesn't fill as fast as I was expecting. On my 285/75R16's (33x11), I can go from about 12-30 PSI in about 3-4 minutes. I've heard it being twice as fast for at least one other gentleman, though I believe I'm getting slower times due to the reduced oxygen at the elevation I've been at when using this unit, roughly 8,000'. I will continue to track the time it takes and update this page accordingly. However, it still works perfectly for my uses and works faster than any other compressor that I've seen in use.
The main thing I wish it had is an on/off switch. Turning it on or off is done by connecting/disconnecting the plug on the far left in the first picture below, which takes some strength to get it disconnected. However, this isn't really a big deal.
The other thing is, when you're done filling up the tires, the heat sink and the brass (or whatever metal it is) hose connection area gets real hot. You'll want a pair of gloves to disconnect the hose. I choose not to put back the battery cables back in the box when I'm done to avoid it coming in contact with the hot parts and risk melting the plastic outer layer. I just throw the cables in on top of stuff when I'm done.
