I camp in the mountains in November and the temperature can go down to 0 degrees (F). I dry camp in the National Forest with a fully winterized trailer for several weeks at a time. Take extra coolers (No Ice.) to store extra jugs of water and drinks so you can have some unfrozen water and drinks. Use a plastic dish pan instead of your sink because your trap can freeze and crack. Take a porta potty but don't fill it with flush water. Use a jug of water if you need to flush, and empty daily. For heat I use a Honda 2Ki Generator
and use a cube heater during the day and evening. At night I use a catalytic heater with a CO2 and fire detector. You also need to slightly crack open your vent to let moisture to escape
or everything will become damp at night. If possible hang up and air out bedding during the day. You will have condensation on your windows
so place towels under your windows
to catch excess condensation. I also place foil insulation over the windows
during the evening and night. Cook outdoors as much as possible to cut down on condensation inside the trailer.
Just yesterday I picked up a Duo- Therm furnace
out of an old pick-up camper which does not require a fan which I plan to put into my winter camper before the hunting season this year. It may seem like a hassle but fall
and winter camping is much more enjoyable than camping in the heat of summer.