As I look out the window, I am very envious of your trip. We did a 7 week camping trip from Ottawa to Key West, with my son who was 5 at the time, about 4 years ago. The first part of our trip is further east than yours as we stopped in Hershey Pa, our first day and then got up early and made it to Savannah Ga. the second day and then we were at Disney on the 3rd day. We went at Easter (April) and most of the Northern campgrounds were still closed but when we got to Savannah the outdoor pool and hot tub were open and we really noticed that we were south. Different KOA campgrounds have different season lengths indicated on the website.
Travelling with my son when he was younger, I always found it easier to go to bed early and get up at 2:00 am and load him into the truck as he would still sleep until at least 6:00 am and then we would stop for breakfast, drive a couple of hours, stop for lunch drive a couple of hours and then stop early in the day and then do something fun for the afternoon. Doing that for just the first day when going south gets you double the distance south so you can take it easy the second day and be somewhere you can hit a swimming pool or do some outdoor activities in t-shirts. Ipads and a lap desk were also great tools for keeping my son busy while travelling.
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