I have a york, and I need to have the RPMS up around 2000 to get it to run an impact gun, I can't imagine a 12 volt compressor coming even close. Sure you may get a lug or two off every ten minutes but thats it.
I carry an impact gun and ratchet. I have gotten too used to using them. True a breaker bar will do most of the same things but the impact gun is much easier. On the Rubicon trail a buddy had a hard time getting a fill plug off his rear axle, it was partially stripped. Two people worked on it for 20 minutes with no luck. I pulled out the impact gun and it came off instantly. I also like the air ratchet for those cramped places where its difficult to get a decent turn on a regular ratchet. Too me the extra 7 lbs is not much of a penalty. Heck at any given point I have more weight in water in my cooler sloshing around
As far as choosing a compressor why not use a york its just as cheap as those other listed 12 volt compressors and puts out 10 times as much air.
I did mine for under $200 with fittings, switches, regulators, hoses and a 2 gallon tank.