Added onboard air today. I used a Smittybilt 2781. I fabricated the tray out of a 5-inch wide piece of 10-ga steel and the feet out of some scrap pieces of 1/8" steel, using a cardboard template. Unfortunately I did not have my flux core voltage/wire feed settings quite right and got a ton of splatter, but no one will see it anyway, so I didn't bother grinding it. It holds the compressor really well.
For the compressor I modified it quite a bit by removing the "handle", threading a M12x1.00 to 1/4" NPT adapter into the cylinder head, and then adding a 4-way NPT block with a pressure switch, safety valve, and QD connector. The actual tires get aired up using a 25' flex coil hose with a inflator and gauge (all 1/4" NPT as well). I wired the compressor directly to the battery using 10-ga wire and a 40-amp circuit breaker.
On a test run I inflated my 32" tire from 18 to 32 psi in 1 min 15 seconds, which is about twice as fast as my handheld compressor. I still have a small air leak where the adapter is threaded into the cylinder head, so I hope I can get a bit more out of it. The Smittybilt is a decent compressor for the money, but it is Chinese....if I was wheeling a lot I'd pony up for a ARB twin. This whole set up with the compressor, bracket, wiring, fittings, etc cost me around $300.
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