Triple E was a good class "C" maker, but they are history as of now, as the company is focusing on the (arguably) more lucrative B market.
If I were going for a cold weather "C", I'd look at a Phoenix Cruiser or Nexus RV. Then, I'd also see if they could add custom skirting, to reduce heat loss under the rig.
From my class "C" experience, I would see about making a foldable divider made with a Coroplast core, Reflectix on the cab side, and a thick blanket on the other side, which would go between the cab and the rest of the coach. This not just adds significant insulation, but helps deaden noise. Done right, it is easily moved out of the way, so the cab can be used for storage space.
