Three years ago in early December, while near the Florida/Georgia state line, we decided to stay in a motel one night when we traveled late one evening. It got down into the mid 20's. The trailer froze up since I did not run the furnace over night. Next evening when we arrived at our site in Florida we had a frozen/burst copper water line inside the kitchen cabinet. I wish I had left the furnace running then! I do now, both on the road or parked, if it is below freezing, unless I have winterized with antifreeze!
2014 Silverado 1500 5.3L maximum trailering package (yes, I'm towing the 34')