Light Air Tank

A 15 inch tire 10 wide is about 6900 cubic inches of air in volume. So to fill a 15" tire to 30 psi would take 1.2 cubic feet of air at 100 psi. To completely fill 2 15" tires to 30 psi would take a standard 20lb propane tank pressurized to 320 psi. Even though propane tanks are rated at 960 psi burst, their service pressure of 240 is never achieved as their blow off valve vents at 200 psi. Your better off with a 30G tank at less pressure.