On this whole subject of keeping warm in your 5th wheel in the winter, I am going to start with the topic of electric space heaters. They use the electric service included in your space rent instead of propane you pay separately for, so they are an economic bargain. BUT any heat source is a fire danger. I use my space heater on my carpeting, but there is a specific warning about that in it's instructions. So, I place an Air Bake cookie sheet in front of it where the IR heat hits the carpet. The carpet does not get hot to the touch. ANY OUTLET USED FOR AN ELECTRIC SPACE HEATER SHOULD BE UPGRADED FROM THE INSTALLED RV ELECTRICAL INSULATION DISPLACEMENT TYPE OUTLET TO A MUCH BETTER ELECTRICAL CONNECTION HOME-STYLE SCREW TERMINAL OUTLET. In my opinion, the small area electrical contact surfaces in the RV style outlets is not up to the long term high current job of electrical heater draws. Also pay attention to cloths, papers, and such flammable items that might get into close proximity to the space heaters.
I guess that it is just common sense for you to wear warm leisure clothing like sweats and warm bathrobes. Don't forget your feet with warm slippers, as cold feet make for a cold feeling body. I have even worn gloves on occasion in the RV.