>>849489>tfw insulated trailer with a furnace or two and plenty of propane/battery (along with a generator if needed) to keep things running through the night or longerI've done the winter-tent-camping thing in boy scouts... checked it off my list. Not something I enjoy.
Bring real firestarting equipment. Road flares work well, I carry a few of them. Firesteel, rub sticks together, whatever else you want... but have something that will start a fire when you need it and doesn't require a ton of time. Just assume everything you have available is going to be wet.
Water ... uhm, fucking snow?! Aluminum avalanche shovel blade over a fire will melt snow into good water.
Bring extra gear.... like socks and gloves. I've got a heated cubby in my sled that will dry out gloves that are damp... once they're soaked, they're done for the day. Usually keep one dry pair for the ride back to the truck.... there are days i'll soak 3-4 pairs of gloves.
LAYER. Avoid a single heavy-insulated jacket. Moisture-wicking base layer, wind-/water-proof outer layer, as-needed between the two.
Know where you're going, know how to navigate (for fucks sake, bring a map/compass and know how to use it... GPS is great, but batteries and cold don't work well).
Let someone know where you're going and when you'll check in or return. SPOT/PLB and a radio aren't bad ideas (also know how to use them and their limitations).
Avalanche gear/education if you're in that terrain.
Know your limits (and the limits of the group). Don't push too hard. A "bad day" in the summer means you're hiking out a few miles in the dark... a bad day in the winter means you're spending the night out there.... no "just hike it out" when there's a few feet of snow to trudge through.