I could see a cart with one of those small propane tanks working one of these.
Of course, that's probably a $1500 idea to make it work between a small tank, tankless heater and propane tank.
If they made a tankless heater without the use of electric to operate the controls, you could have something to sell to other race car drivers. $$$$
Money shouldn't be the objective in this since racing is an expensive endeavor...post pics when you get one together!