Me, wife, and now 11 year old have been winter camping and skiing in our TC for the last 10 years. The majority of our ski camping has been in the parking lot at Mount Baker during Oregon spring break. Baker isn't too high of elevation, but some years there were some low 20F nights, other years it rained half the time and dumped powder the other half. So yeah, it's impossible with whatever heating system to keep condensation down. You can only hope for a sunny day, towels, and your furnace cranking to keep the family warm.
Anywho.
Started with a 3/4 ton Chevy with a Western Wilderness 9' camper. Awesome camper, can't say enough about it. After what I've put it through it's amazing everything still works.
I was always a couple of hundred pounds over in the 3/4 ton when we were all loaded with ski stuff, so upgraded to a 1 ton dually.
I'm was thinking of getting a newer, slightly larger/heavier camper with a slide out, but the more I think about it, a lighter non slide version of what I have now probably makes more sense for some of the situations we take it in.
I always kid that our camper is a tent on wheels, that's the purpose, a warm place to sleep, the rest of the time we should be fishing, surfing, or skiing, or just being outdoors. It's worked out great for us. I think you're on the right track, get a 3/4 ton with good wheels and tires, a newer lighter weight hardside camper with a good furnace and you're good to go. Oh, and a generator, something to charge the battery during the day.
Here's another from Hoodoo, our first trip to the snow in it. It was a good day up at Hoodoo, they have electrical, so if you bring a space heater you're set.
edit: that moment you realize you just posted to a 2 year old thread :)