Only one year did I pay the price for not keeping my travel trailer going with some heat. When we were notified by the "city" we had to move our travel trailer because we were in violation of city zoning, we ended up taking it about 70 miles to my wife's parents farm and left it there .... UNTIL we sold the house and moved to a different county completely. (yes, we were THAT pi$$ed!)
Meanwhile, that winter outside temps (without the wind) dropped to -22 (F). The trailer was winterized well. But 2 things happened. The extreme cold cracked the vinal shower surround and the extreme cold cracked the linoleum floor.
Had the camper been at our house, I would have kept an electric heater going inside the camper over those extreme cold days and nights. But parked so far way, and being on someone else's property, I did not want to use their electricity. (long story ... my wife's mother *is* a poop-head! It's amazing she let us park the camper there. Her husband --- not my wife's father --- argued the case for us and let us park it there).
That was the coldest winter we experienced with any of our campers. No other time did we have any issues with anything, even in other years when it got to 10 below. But at 22 below, I guess that was just too much for the poor camper!