IMO there are no TT manufactured for winter conditions.
There are some that are better than others but they will still be hard to maintain and will require extra preparation to set up.
First and foremost is the maintenance of water and sewer connections. Heat tapes must be places on the water hose and sewer pipes to maintain flow. Holding tanks must have extra insulation and heat to prevent freezing.
Skirting of some sort, hopefully insulated, will help as well in preventing the water and sewer lines from freezing.
Water lines inside the unit are generally placed against the outside wall so care must be taken to have adequate warm air ventilation around the lines to keep them from freezing in cold weather.
Heating the unit will require extra heaters to be totally comfortable. Adding an electric heater or two will help warm the corners.
Ventilation and humidity are an issue. I am not aware of any trailer that contains vapor barrier. If there is that would be a brand to consider. Without vapor barrier the water vapor will condense in the walls and ceiling and create frost. Frost will reduce the insulation (pink) efficiency. Spray foam insulation does not need vapor barrier.
Another issue is insulating the roof vents. Adding insulation packs will help but moisture can still get in and condense on the lids.
If living in a TT in winter time and using the cooking and shower facilities it may be prudent to run a dehumidifier.
IMO if there are rental facilities available it would be less costly to rent a room rather than trying to stay in a TT.
Gordon and Janet
Tour 42QD/inTech Stacker