I have a small compressor to air up my tires when I need to, its not fast, but it does the job...the Costco one that everyone was hyper about a couple of three or 4 yrs ago.
As far as for actuating my ARBs, I picked up a small regulator at Lowes designed for use with the 9 and 20 OZ CO2 tanks (used for brad-nailers, etc). It came as a kit...with a case. I carry 2 20 OZ cylinders. I have never even used up the first one completely in 4-5 trips. The regulator is adjustable, has a quick connect, hose, etc. I picked up a junction block from power-tank and am using the solenoid switches mounted up on the dash. All the plumbing is always there...just pull out a tank, the regulator, set it and plug it into the distribution block.
The nice thing about the smaller tanks is that you can keep them anywhere, which means you dont have to worry about someone swiping your $300 P-tank setup when you go into the store. As well, filling or picking one up is pretty easy almost anywhere in the country (paint ball supply, gas shop, Lowes). Since I carry mulitples-all the time in my storage trunk, if necessary, I can burn one up to reseat a bead... and still have plenty of air for a several days of wheeling. I have posted about this in a couple of other threads...so you might try a search
Here is a link.
http://www.lowes.com/pd_82384-61735...l=1¤tURL=/pl__0__s?Ntt=kobalt+regulator
I havent had any problems and no leaks. A great option in my opinion, for those that need or want stealth air for their ARBs. Dont get me wrong, the Powertank and similar products are sweet. I wouldnt mind having one, but its a storage and security issue...and possibly a safety issue for anyone in the back-seat area.
As well, while you can get tnew tanks and have old tanks filled at Lowes, I have found that buying a couple of aluminum tanks from a paintball supply and getting them filled there is a better option (~$4-5, per refill).
Good luck!
John