Decided to put my own "power tank" together for airing up the jeep tires (on the trails) and i wanted something that could also be used for topping off the coach tires (w/out having to run the coach engine).
Im not a huge fan of the OBA (on board air) systems - no portability for one & the duty cycle of the compressors are pretty poor w/out a significant investment of several 100 bucks (and even then air-ups are not quick).
I usually depend on my coach air & 50 feet of hose for topping up my coach tires - but its a pain w/ 110 psi tires (having someone pump the brakes to get the compressor running up to the limit).
most of the power tank solutions are expensive ($200-300 at a minimum) and they typically are only meant for filling low pressure tires (regulators fixed or limited at 50-100 psi at the most).
I had some c02 tanks sitting in my garage (2 are brand new), one is VERY old (given to me for use w/ my kegerator, which ive never needed, since one came w/ the fridge/conversion kit).
I finally found a 2 stage adjustable regulator that pops-off at 175 psi so for about 75 bucks ive made my own power tank...and i can fill/exchange the tank for about 14-20 bucks.
I'll be adding a protective carry handle like this one -
and ill be adding a quick disconnect to my regulator to run an air chuck/fill gauge or air tools.
the regulator was 60 bucks -