i had my small compressor/tank in a wood box i built when i had my XJ, well the compressor finally started to die (what can ya say about a $7 compressor), it would build pressure over 30#. i was looking at getting a CO2 tank setup but all the store bought ones have nice tanks and nobody around here will fill them, they just exchange them, so i wasnt going to buy a $500 powertank to turn in the nice tank. called around and nobody had a 10# tank only 5 or 15, im not planning on running air tools so i figured a 5# would work fine for me and take up less space.
went to airgas here in town and picked up a 5# tank for about $100, ordered a 150PSI fixed hi-flow regulator with quick disconnect air chuck and a mounting bracket for $105 shipped, i already had the hose and fittings so no cost there. i now have a CO2 tank setup that cost me about $205. this also gave me more room in the back of the 4runner.
old setup
new setup (i need to shorten my wires now on my inverter since i had to relocate it)
also picked this up and mounted it