Nice!
Both to your 'name' and the wording of your question!
While I don't have a direct suggestion in regards to make/model, I can pass along some info.
I've camped at Rogers Pass, BC in a generic S&S camper in sub 0 degree temps, with no problems. That being said, I dried (& kept) both my ski cloths & boots (phew!) in a friends hotel room & warmed up/cleaned off in the hotel's outside hot tub! (In case you've never been there, there's a hotel at the Pass you can stay at, put your ski boots on in your room, click into your skiis in the parking lot, & go skiing)
My factory heater did fine keeping me warm, but I had a 0 degree bag and was plugged into electric (to help my furnace blower motor) through my friends hotel window.
In my limited cold weather camping with a stock camper, it seems to me the weak points (beside the obvious lack of insulation, I'll get to that later), is the necessity of battery power to run the blower fan on the stock heater, and the necessity of ventilation, especially when trying to dry clothes and boots.
While my current camper is not set up for this, I've talked to numerous folks, both ski camping & (in of all places, Baja!) that have their 'stock' campers setup for winter camping. They all had an auxiliary power source (mostly small generators) to run the blower on their stock furnace; or a very expensive, but efficient, diesel heater. They dried their gear (mostly with boot driers, ambient heat, and positive ventilation) in their bathrooms. Invariably, they all did ALOT of insulating with foil-backed foam, both on obvious places like windows, but also on exterior walls and small places like exterior access doors, etc.
Hope this helps, pray for snow!
I like big dumps!
Kevin