12v Air compressor question!? High Volume? Beach camping

If you are handy you can assemble your own compressed CO2 setup pretty cheap. 10# cylinder (current hydro & stamping for refill) along with a regulator for under $200 and would be REAL fast. These thing can handle quite a few tires easily and you are only limited by the flow rate of the regulator, hose & valve stem. Get the bottle refilled at a dive shop or welding supply company. Once the tires are aired up and you are safely home you can pressurize a keg and call it a day!