Super tanks and CO2 are totally awsome. CO2 has enough pressure to set beads with little effort. I can run air tools on the trail, and fill up all six tires twice from 5lbs to 25lbs, and fill up 5 other trucks tires as well on one tank. I carry two tanks, a 20 pounder and a 15 with a 55 pounder back at the trailer to fill the small ones up. PSI can range from5lbs to 180+ for setting beads. An onboard compressor can't do that.
Plus if you have a fire and your fire extigquisher runs our, you just get your jet nozzle on your power tank hose, tip the tank upside down(to get at the liquid co2) and you have a huge, very effective fire extinguser. Put out engine fires, gas fires, camp fires( not recommended because if you have the pressure up to high you end up blowing embers all over the place), and electrical fires. Onboard commpressers can't do that.
And finally, you can use the power tanks to re-fill your Paintball guns so you can continue shooting at your friends.