[ktmracer]

some of the new west coast cougars appear to be much more well insulated with a different "winter" package than the polar package. thermopane windows, foam in the attic instead of fiberglass batts. Insulation in the pass throughs next to beds, insulation along the frame rails and above the coreplast. Direct heat to the underbelly.

Claim is you can use the trailer down to 0F.

Still, given the window area and sidewall thickness, there is only so much you can do to keep heat in.