No matter what you decide, staying in TN during the winter is no treat. During the last several years southern Illinois and TN have gotten more snow and worse winter weather than central Illinois.
The CG managers and other winter campers in that area should be able to give you tips on how to set your RV up for their winters in that area.
We spent part of December in the north and one of the things I had to do was pour RV antifreeze down my toilet instead of all water. I found when the temps stayed below 28 - 30 degrees my black tank gate valve would freeze in the closed position. Keeping RV antifreeze in the black tank solved the problem and I could dump every week or as needed.
