Congratulations and welcome to the site.
Well if you have a full tank of propane you could simply set the furnace to 40F or so and let it run (granted with it being 21F out you'll burn through a lot of that propane).
If you're using space heaters (at most 2 as you'll start throwing breakers with more) you'll want one in the front (with the kitchen cabinets open to let the heat in there) and one in the rear (water tank and pump are under the passenger bed).
Leave the waste tank heaters on (switches on the main panel), and get some pink RV antifreeze (just 1 gallon) and dump some in the drains (for extra insurance and to keep the traps from freezing).
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