I am a ski RV veteran with many years experience. I have also seen many unhappy RV renters frozen solid in ski resort parking lots.
It seems like a wonderful idea to wake up, walk across the parking lot and get on the lift but
- Unless you have 4 or more people it isn't cheaper if you add up rental charges, insurance and fuel (8 imperial MPG would be typical)
- You better be really good friends because after a few days in a tiny RV you may want to kill each other
- Most RVs (ie the ones made in the USA) are not made for winter. Their plumbing freezes solid meaning no water, shower or toilet, condensation soaks the interior and they are just generally miserable. Three Canadian built RVs can handle the cold - Triple E, Citation, and Travelaire. My Triple E has been in -25c with no problems. If you want something that works fly to Calgary or Vancouver and rent a Triple E from Go West RV.
- Once you get the RV you have to drive it on snowy and icy mountainous roads. They aren't like driving a car. A 24 foot Class C weighs in at almost 15,000 lbs., it doesn't have real snow tires and is like driving a bill board down the road. The first time you have a 30 km side wind on a white ice road you will see God.
- Yes they have a furnace but it draws at least 7 amps and you batteries are much less efficient due to cold meaning you have to be plugged into 110 volts at least every second day or you kill your batteries. No heat = everything frozen solid. Most ski area don't have plugins and most RV resorts are closed in winter.
- Even if the plumbing in the RV works where do you dump the tanks? Most sanidumps are buried under snow and frozen. Getting water is even more difficult as all outside taps are shut off and you can't drive the RV into a typical heated garage.
Having my own RV means I know where to go and how to avoid problems but for a newbie it is a recipe for ruining a perfectly good ski vacation. Renting an RV in winter is certainly an adventure but so is a root canal.