Another Oldie but goodie. NOT MINE

I'll bet the propane furnace in that rig has a pilot light lit, is fanless, and vented to the outside design .... similar to the type propane furnace we had in our 1969 Chinook!

I wish they still offered those kind of propane furnaces for RV's - no battery consumption, along with no oxygen consumption of the air or pollution into the air inside the living area.