If you have constant power and it was me, I'd just use the heat pump on electric set to 55 or 60 degrees. That way you save your propane. I would think that your temps are comparable to here in north Texas. My Northpoint is currently winterized (all I did was blow out the lines) and my batteries are hooked up to a battery tender. I just checked on it today and all is good!
Congrats on the new camper!