Andy,
Other than protecting things from the high heat coming out the end of the blaster the biggy is ventilation, which it looks like you'll have plenty of; those things are not intended for use in enclosed spaces.
If I had my druthers, I'd use an electric space heater or two. This assumes, of course, that you can get power to the bus (use a good heavy duty outdoor power cord). That way you can leave the doors closed and not worry about permanently going to sleep.
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