He could have just bought a pair of Truck Air compressors from K-Mart instead. I can't imagine they push a whole lot of air, probably 10+ minutes a tire to air up. Somewhat interesting. For that matter he could have modified a junkyard A/C compressor for less.
I didn't want to give up my air either so some friends and I made a mounting bracket, battery tray, and relocation bracket for the A/C receiver/drier. It runs off a longer serp belt. I can air up tires quick now but I just need to make an air tank and finish plumbing stuff.