HAve to disagree on this one. To move your tank(C02) you have to un mount it, and carry it to where you need it. Me, I just pull out my hose, have two coiled ones, and air up or what ever. Finished just put the hose away. Not sure about around there, but around here full size waggys are abundant. So there is all your brackets and compressor. get the hoses to it. Once installed cut them. One for air intake with some sort of filter, one for your airline. Lowes sells all fittings needed. Put in your pressure switch, I got mine at NAPA for like $20, and some line run to your air tank. Many ways of doing it. I think I have less than 60 bucks in my whole set up. And I never have to go fill it up. At idle it fills in about 3 mins, and at 1600 rpm's in about 1 min. I can run my grinder, wire brush, impact, and drill.
As far as the re-seating a bead, it's more of a volumn thing than a pressure thing. Best set up I have seen is a guy who used a bead blaster as an air tank. He could remove it if needed. Had like a 1" pipe about 16: long with a valve. with the tank full, he put it pointed to the bead and opened the valve. It released so much air at once the tire seated imeadiatly! Kewl set up.
My .02