Buy the good de-icer window wash fluid. I prefer the purple stuff, but the orange stuff works too. If you expect deep snow overnight, stop the wipers half way, then pull them off the windshield so when you clean the windshield in the morning, it won't tear a wiper blade and they won't be in the way.
Carry a couple cheap wool moving blankets, some water, snacks and reading material. When you get stuck over the hill because the roads are closed, you need something to kill the time and keep warm. Also works if you get stuck or break down. In a pinch, the blankets can be thrown under the tires and used to free yourself from hard packed frozen snow. Floormats also work good, but I don't recommend using your favorite jacket or a Coach purse....
If your rig won't warm up, cut some cardboard and leave a small hole in the center about 6" diameter. Put it in front of your radiator and center the hole around where the fan clutch goes. If you hear the fan clutch come on, watch the temps, you may need to trim the cardboard or remove it, especially if towing.
Use lighter oil, it's better to burn a little more, than starve the motor with 40W glue when you start it.
Use some of that fancy anti-fog stuff on your windows, it will make your shirt sleeves and napkins last longer..
Always keep a couple tow straps in the rig. You can make $$$ pulling the idiots out of the ditch.