If your TT is truly four-season, you should be able to fire up the furnace, warm it up, dewinterize, and have full use of the RV. That's what four season is supposed to mean.
Using it winterized basically means not using the plumbing, it becomes a hard-sided tent with heat and stove. My tip is to stay on the grid, or have a power source, because battery power for furnace, fridge and lighting is not going to last long, particularly in cold weather.
I RV in the winter, but mostly to get to where it is not below freezing around the clock. Sub-freezing use of a RV needs a different strategy, and I've mostly seen it done with four season motorcoaches, which bring along substantial powerplants and heating plants with big fuel supplies.