the nice thing about a co2 bottle is the higher pressure - with an adjustable 175 psi regulator (about 60 bucks) you can TOP OFF or fill a 22.5 inch coach tire fast...and you don't have to run a buzzy compressor or the coach engine/compressor.
they also make fixed pressure (no gauge) 150 psi regulators for a little less $.
I used to carry a 5 lb bottle - but decided to up the game a little to a 10 lb.
building your own bottle & regulator is SIGNIFICANTLY cheaper than purchasing one of those pre-fab'd PowerTank or Smitty Built systems ($250-$400+) and they perform exactly the same. tank refills or exchanges are about 10 bucks tops (something you cant do w/ the PowerTank or Smitty).
