1) If your "In the yard" run a drop cord to the RV, plug it in and run the furnace with a 50 degree setting. It will be ok.
2) When camping in Nov? I would only use that space heater as a supplement heat. Again run the furnace. Problems start (In colder weather) when temps drop in the lower twenties.
30 Keep the fresh water tank full and use it. It is easier. When camping connect the water hose, fill up the tank and then disconnect. I put the hose in the shower, at the ready.