Chattanooga does stay a bit warmer due to the TN River flowing thru it. We lived in Chester Frost County Park/ Harrison Bay State Park both on the East side of Chattanooga and Racoon Mtn Campground in Tiftonia on the West side… all “suburbs” of Chattanooga in a Apache Hard-sided pop-up camper thru one of the snowiest winters Chattanooga had in years (1996?). The following winter we bought a house moved to Whitwell (on top of Whitwell Mtn)… about 1 hour west of Chattanooga off I24 (hang a left at the bottom of Monteagle Mtn on I24 to Kimball). We lived there for about 10 years. So yes, I do know about TN winters. I also have spent lots of time winter camping. use heat tape on your water lines and place pipe insulation over that. Keep it plugged in overnight. The tape will keep your pipes from freezing and the insulation will prevent it from freezing up as you go to your site. What kind of water heater do you have? Can you make a water heater blanket for your heater? If you want to sell during the winter months, then you need to set up for it.
Last winter… we were in South TX… a little frost in the early mornings but no snow, no ice… warned up often enough to go walk down the beach on the National Seashore…. Nice! [8D]