I often camp in the early and late season with the temps in the low 20's, and have not had any issues. We have a hybrid, so I would not call it a cold weather tt. We do not have an enclosed underbelly. We put water in the fw tank. All the fw piping runs inside the tt, so we just leave the cabinet doors ajar. Our floor is a composite, two layers of OSB, with about 2" of Styrofoam, in between.
If, I was planning a lot of cooler weather camping, I would buy a tt, with the enclosed underbelly, pull it off, and add 120 volt tank heaters, and wrap the sewer line with, heat tape, and pipe insulation.
I have no condensation issue, others do. My parent's SOB TT, has a lot condensation and frost in areas where they have metal framing, such as between the walls and roof. So, I would investigate the framing design, and thermal breaks.
Good luck.
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