airstream skiing? what fun!
there are several threads that can guide you on winter camping, winter living...and so on.
had an exchange with someone headed to mammoth recently...so searching for skiing, mammoth can also help.
furnace fan runs on 12v
...depending on your batteries (#, size, type) should keep the furnace running overnight...without generator.
2k generator is plenty...1-2 hours morning and evening should keep batteries well charged.
do any 120 applicance work while the gen set is running...like say coffee pot or microwave....it's better to rely on lpgas for cooking....
turn thermostat way down in the day time...and watch lights, water pump in the evening and overnight....turn it all off and use a flashlight.
wear a night cap and mukluks at bedtime...don't forget the nightshirt or jamm's
easiest thing is to find a ski region that already has a parking lot/area for rvs....often they will have electric plug area for small fee.
know where the closest place is to get lp gas and know how to remove/replace your lp lines, tanks and so on.
2-3 days is easy, a week is more fun but trailer moisture and holding tanks become an issue....
once stayed several weeks at a ski resort....and shoveling snow became an issue too....i loved it.