You'll probably need to use the LP heater because most RV's are set up to have a vent from the heater in the wet bay to keep things from freezing. Putting a 100 w light bulb or two in the wet bay can also be an insurance to keep things from getting too cold.
Your drain valve is just a start to winterizing, you'd have to drain the water heater, blow out the plumbing with air or pump RV antifreeze into all lines and also fill the traps in all drains to really winterize. Best for a week or two to leave the heat on. If you start with a full LP tank I think you'll be fine. A small electric space heater can also be used in the RV, just make sure it doesn't keep the LP furnace from coming on and heating the wet bay.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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