I just bought one of these: http://www.amazon.com/Master-Flow-M...AD2U/ref=sr_1_2?ie=UTF8&qid=1334153184&sr=8-2 It's a cheapo made-in-China (I can hear BB running out to get one now ) portable compressor that actually gets decent marks from the off-road community for its ability to air up oversize tires in a reasonable amount of time without blowing up. It's not hard to find folks who are getting many years of use out of these things. Not bad for $50-sometimes you can even find them on sale for $25. I paid $50 for mine, but I was thinking of trying to snag another one when they go on sale. These little guys put out 2.5 CFM and a max pressure of 150 psi. I was wondering, if I plumbed two of them together with a simple tee into a tank, the tank would see 5 CFM but the max pressure would stay the same, correct? There's actually a nice little tutorial on 4x4wire that shows how to take them apart and port them with a Dremel for more flow, maybe 3 CFM, so if my theory is correct, that little trick would result in 6-7 CFM to the tank. That would be about equivalent of a good OBA system using a repurposed vehicle AC compressor, with the advantage of less underhood plumbing and the ability to move the thing around if need be. The other big question is electrical in nature-these things draw 30A at full load. The write up that I saw used 10GA wire for one compressor, so for a similar run (let's call it 8' from the battery) for two compressors what should I be using? 6GA with a 60A inline fuse? Or just run two 10GA lines with separate 30A fuses?