The trailer should have had a "cold weather package" installed -- which keeps not only the running potable water from freezing - but the gray and black water tanks and lines as well.
A "skirt" around the base of the trailer - even if it was just some plywood sheets cut to be able to block the wind and capture some residual heat thru the floor etc would (should be WOOD for a pun) also help maybe.
What a fun adventure!
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