Originally Posted by whiterhino
He's not over thinking it. He already owns the tank and if it were full, it would be the easiest way to fill the tire.
Yes, if it were full. But it's not. And places to fill CO2 on a Saturday aren't too plentiful. So he can run out a few gallons of gas and waste a couple hours trying to get the tank filled, or he could go to the trailer with a 12 volt comp and fill it in a half hour and be done.
Or, he could have checked his tank on Wednesday, so he would have a couple days to fill it before going to get the trailer. Or he could just blow into the valve stem.
I filled a flat tire on my motorhome (8.75x16.5) enough to drive to a gas station a mile away in about 10 minutes. Just giving an option when CO2 is not available.