In addition to all of Chuck's excellent insights a few other thoughts.
If possible, orient your trailer so the tongue or the bumper is facing toward the prevailing winds. The tongue would be better as the curved front would help the wind slide over the trailer better.
Insulate the pass through from the living space. It doesn't need to be heated and your bed will stay a LOT warmer. I used rigid foam, pics attached.
Install a second carbon monoxide detector and replace the smoke detector with one designed for kitchens to minimize false alarms. And install a smoke detector in your crawl space under the camper if you have a heater down there as Chuck suggested.
You're going to want at least two 100# lp tanks, a 20 lb tank will last less than a day when your furnace is running almost constantly.
Use desiccants in all your cabinets, you can get tubs at Dollar Tree. Don't put items tight against the outside wall or ceiling of cabinets, you will get frost.
I'll share more insights later from my late fall and winter camping when I had a snowmobile here in upstate NY experience, just south of the Canadian border.
