My husband and I full-time in our motorhome so hopefully I can help. We stay in Fl in the winter and go up to the NE TN mountains in the summer. The Tn mountains are beautiful.
Have you rv'd before? Why are you choosing KOA's? Rving can be tricky in the cold weather. You really need to make sure you know how everything works or you could end up with frozen lines and leaks.
What route are you taking? We usually go I-95 north to I-26 into Asheville and north to Johnson City, TN and then we head east to our property.
To get an idea about campgrounds go to
RVparkreviews.com :: Home and look up by state and then city. You can also try Trailer Life Directory and Woodall's. I prefer the TL Directory b/c it tells you more about the actual sites(we are 40 ft. long, so I have to make sure we can get in). A fantastic book for traveling the highways is called "The Next Exit". It is a definate must have for driving.
What size rig are you renting? Gas or Diesel? Diesel drives smoother and better especially in the mountains.
I have tons of info to share if you are interested. You can PM me anytime.
Lisa