I will also vouch for heated floors if it is offered. Our coach has the heat pads under the wood flooring. It is amazingly nice to have the warm touch on your feet in the winter months. Ours are set-up with four zones.
We also have electric toe-kick heaters built into the baseboard (one in the kitchen/living area and one in the rear bath). The diesel fired furnace is used on extremely cold days. I do try and exercise the furnace monthly.
In our previous Dynasty with tile floors, we had a small box heater that I would set between the driver's and passenger seats facing the living area. It kept the floors warm all night (the bedroom had carpet).
Safe travels,
MM.