Yes, it CAN be done.
Yes, it has been done.
Yes, I have done it!
In MONTANA!
In a 32 foot Suncrest motorhome.
And, in a 32 foot triple slide Monaco McKenzie fifth wheel.
First, you should have some kind of skirting around the coach. DO NOT use hay or straw bales! They are a fire hazard, and they attract rodents. I used Reflectix insulation (aluminized bubble wrap). I also covered the grill and the windshield with it.
Second, the plastic "storm window" covers work fairly well. Also, the pillows that can be put in the roof vents are great.
Third, the water supply line must be heat taped and insulated. There is a right way and a wrong way to install heat tape. Read the instructions and be sure it is done right. I built my water line out of hard copper tubing, then installed the heat tape and wrapped it with pipe insulation. No problems to 20 below! I found no special consideration was needed for the sewer hose. The hot water running through it seemed to keep it from freezing.
Fourth, an auxiliary propane tank is a wonderful thing. In the motorhome, I bought a 100 pound cylinder, and refilled it as needed. In the fifth wheel, I leased an 80 GALLON tank, and the propane company came out and filled it as needed. That was MUCH better than rassling that big cylinder myself! The tech who brought the tank to the trailer did the hookup. That, too, was a plus!
If you will have full hookups (I would not be willing to "winter over" without them. It can be done, I simply would not be willing to do it.), a small electric heater can be very handy.
CM1, USN (RET)
2017 Jayco TT
Daily Driver: '14 Subaru Outback
1998 Dodge QC LWB, Cummins, 5 speed, 4X2
2 Kawasaki Brute Force 750 ATVs.
Pride Raptor 3 wheeled off-road capable mobility scooter
"When seconds count, help is only minutes away!"