Not everyone heads south with the Canada Geese when the leaves turn.
Some RVr's enjoy the various winter activities, while some have a sudden change of plans due to family or medical emergencies and have to prepare to stay in a climate that many motorhomes are not really made for.
This video, made in BC, gives some good tips on preparing to survive and maybe even enjoying the winter stay in your RV.
This is not an Airstream motorhome, but the same tips can be used on any RV.
The only caution I would make on this video is regarding the portable propane heater. I would not use one of these except in an emergency because of the moisture and condensation problems that can occur inside.
One thing that is not mentioned is the snow build up on the roof. The snow is a great insulator, but if you have solar panels that your are depending on, you will be out of luck when the snow builds up. I recommend to NOT try to remove snow load from the roof as damage can be done to brittle Air Conditioning covers, vents, solar panels, etc.
HOW TO: RV in the Winter - YouTube