I think you'd be ok and I would do it if I were in your shoes. I'd be more concerned with your diesel fuel gelling than camper issues.
When I camp in the cold, I run my generator non-stop and run a 1500 watt electric heater. It is also supplemented by a small catalytic propane heater. Usually the electric heater does quite well by itself and the propane furnace doesn't come on much at night. If you have the capacity or are running shore power, 2 1500 watt electric heaters would keep things nice and cozy.
Never had an issue with fridge, furnace, or hot water heater at altitudes up to 11,300 feet so I wouldn't worry about that. Propane appliances may be harder to start and using a butane pen torch may be necessary worst case for hot water heater if it won't fire up.
Where are you planning on camping? I'd be more concerned about snowstorms and getting stuck.