Another option, which might be cheaper for some (though not cheaper than buying used stuff out of the junk yard)--
I bought a 12v compressor, in the US but I think the company is australian. It's called "big red" but it is made by one of the main compressor manufacturers, thomas I think. So I bolted it into the rear of the jeep, ran wires, switch, relay, etc forward to the battery, and everything works great. Add a 25' coil hose and it will pump up all the tires in a few minutes. Not as fast as an engine-driven compressor, and no running of air tools, but installing it was nice and easy, and it supplies enough air for my needs. There are a bunch of companies offering similar products if you don't want to go looking through the junk yards...
(And if you do like junkyards, I am told that older cadillacs had air-controlled suspensions, with nice strong air compressors.)
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