A 10lb CO2 bottle will 10-12 sets of 33" tires from 15lbs to 40lbs. I have a 10lb, and a 20lb bottle.
It is self contained, you can run impact tools on it as well. I don't think you can fill your air tank at home with a normal cheap compressor. In order to get enough volume to mean anything other than a single tire fill up, you are going to have to go to a SCUBA tank. Plus, not sure how many little home compressors can go tto 200psi. My big 30 gal Craftsman gets rough when I get in to 160s...a 200PSI compressor=$$$.

I do have a question, what offroading do you do? Pics or it never happened

Sorry, couldn't help it, lots of fancy gear, only offroad I have seen from you is at the beach...and that doesn't count. Come to the spring Uwharrie meet!!!