Draw back of propane heat is that is produces water vapor and Co, so it can contribute to moisture issues inside the car.
My parents have offered to let me us their VW gasoline heater that they have left from a VW bus they used to have and I passed it up for the same reason as Ben.
Another thing to think about is a slip cover for your radiator heater that you stick behind the seat, if you can keep the mass of it warm then when you pull the slip cover off it goes back to heating the car.
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