I lived in a 24 foot Kit Companion trailer for a couple years in what is the Siberia of our fair state. Luckily, those were two warmer than normal winters as it only got to -5. I would wake up to frost on the walls. Then that would drip off. It was a 1970 something and there was no exhaust fan in it.
Because I knew it was a frigid environment, I had heat tape around the water hose, skirting around the trailer, and I plugged up half the windows with fiberglass batting. I tried to never cool spaghetti or anything that needed boiling for very long, or simmering. The refrigerator would not work when temps got much below freezing so I had a cooler that was kept outside. I learned about the fridge after going to SoCal on a fire crew around Thanksgiving. I came back to a horribly smelling little trailer. Frozen things had thawed and were rotting...icky.
The furnace never did work. I had electricity, so ran one space heater and had a mini one that I'd turn on when it was really cold.
It wasn't very healthy--feet were always cold while at head level it was very warm. I was glad when I found a real house to rent.
Hope you don't have to live that way very long.