What compressor and tank to run

Ok, I just bought 8 of the Blitzluft blackjack 1/2" 280 psi valves and was wondering what copmressor to use and what size tank to run. The truck I just bought already had the back set up for bags (just the notch and brackets and bags). And I'm new to the bag setup. FBI sai to run dual viar 380c's or a big unit. I was wondering why the dual pack. Why not just run one 400c? I'm confused on this.

oasis, they are expensive, and worth every penny. there is a guy selling one in the auto parts section of san diegos craigslist for $400.

i was taught 2 is better than one.if one happens 2 act up u got another compressor there.two 380's on a 5gal tank will fill quick and put less strain and heat on the compressors..and run the pressure switch and relays for a relaible setup...

or u could also run some 480's man they are bad ass you will love the air supply you will have available the 380's are good to what is it doin on and how much room you got to mount a tank and the oasis in my opinion is alot of maint. and bein as to how ur a newbie prob better off and be happier with a viair dual pack