BartonT, as an ex-Canuck, we all know driving in snow is not impossible if you have to. But we RVer's are usually on a flexible schedule. I drove my Class A south several winters in a row without incident, just was ready to delay if the roads were bad. I was only caught in the snow once, in mountainous Utah -- I didn't like it, but the rig was heavy and ran just fine.
Most all the Interstates and major Canadian routes are bare surface within a day or two after a snowfall. It's not that far down to say, mid-Indiana where bad weather is the exception. I didn;t even try to de-winterize until I was in a warmer area.
That said, I also stored my rig 6 months in Raleigh NC and flew back and forth to continue our trip. That worked okay, but I wanted indoor storage and that was not cheap.