Living in and camping, are to different objectives for an RV. We take our 2010 Dutchmen out to the State Parks in winter. We shut the water down and use the park's heated wash house.
During the day when we are outside, the TT is typically abounds 50 degrees or so with a small electric space heater. In the evening we warm it up till bed time.
Cooking is done with a water jug from home, dishes wait till we get home.
A four season TT with heated tanks would be nice for sure but most anyone can handle a day or two of roughing it.
Now if you plan to stay in it for any length of time, that is a completely different story.