When I travel to the north, I bring a small kerosene heater.
Before I drive, I heat the interior hot enough to get everything warm
and all ice melted.  When I am ready to drive, I turn heater off (me
not that stupid) and then drive for as long as can and then pull off
and repeat process.
    Maybe it would be better to install with a exhaust pipe through
the roof and run while driving also.

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