The newest Power Tank size is this 20 lb. system. If you need lots of air for your full size sand truck and toy hauler or you want a larger high performance Power Tank air system for your team support trailer (autocross, motocross, desert, sand, etc.) this is the size you want. One 20 lb. tank of CO2 is enough to remove 720 lug nuts with a 1/2" impact wrench. Or imagine airing up twenty 35" tires from 10 PSI to 40 PSI, each in less than a minute. If you're running nitrogen shocks and you want a regulator that will work on an N2 bottle get the PRO Series XP400 Regulator Upgrade along with an N2 valve adapter (FIT-0002). Quit wasting time. Buy a Power Tank before your next trip.