We withstood the -30 temps on the border of South Dakota and Iowa last week in ours the trailer was perfectly fine........ the water spigot in the ground froze up. Had to go to the gym to shower.
the following day we built a little fire at the base of the water spigot and after about 20-30 minutes you could hear the ice start to “boil” inside the pipe and had water for about 6 hrs before the spigot froze again.
glad to hear other big country owners are having success in these frigid temps.