Last winter I spent the winter in TN. I got a 25' (?) extension propane hose from Mr Heater. Ran the hose under the drawer in the kitchen to the outdoor shower door. (had to drill a two holes) Connected the Mr Heater to a 40 lb propane tanks.
Keep the TT warm all winter and probable more efficient than the furnace. I did add 2 more CO detector. They never set of an alarm so I think it is safe.
Problem,
(1) LOTS of moister in the trailer when running the heater.
(2) Since no heat in the floor ducts, on very cold nights the water line would freeze. Since I turned off the water pump and turned on the water to relieve the pressure no broken water lines.