I live NW of Baton Rouge and will be using the TT through the winter so I won't do anything like "winterizing". What I do do is I have a medium room size ceramic heater in the middle of the TT and set it for about 60 degrees. I then turn the furnace to the lowest setting on the thermostat (55 degrees). I placed a wireless outdoor thermometer on top of the water heater to monitor the temp in the storage compartment where the hot water heater, plumbing, and water filter is. Over the two last "hard freezes" we have had in the past couple weeks I have not seen the temp in that compartment go below 42 degrees. The tanks are all empty but that is it. I also open the cabinets under the vanity and kitchen sink. The hot water heater and storage compartment are up front under the bed so I lifted the bed so the warm air will have access to the divider wall. All seems good. If you are in north MS you may need to do more, but with the daytime temps getting above 50, I don't think there will be much of a problem.
2013 Cardinal 3800FL
2009 GMC 3500HD CC LB SRW