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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
You will want a heated water line to the RV.
You will want to enclose the undercarriage and radiator opening with some sort of insulation like foam board.
You will want to heat the underbelly to prevent the tanks and lines from freezing, which will also transfer heat to the RV through the floor. A ceramic disc heater like the Pelonis 5000 watt will do this effectively.
I would also use the foam board to seal off skylights and roof vents.
I would also use a dehumidifier.
Here is some cold RV living info.
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Hello again Chris here,