Tom,
We are leaving on a similar trip in late May.
1st Stop 2 nights at Ft Clinch State Park near Jacksonville, FL
230 miles to 2nd stop 4 nghts at Santee St Park, Santee, SC
254 miles to 3rd stop Ft Tatham Camping (Carefree Resorts) Sylva, NC 5 nights
314 miles to 4th stop Diamond Caverns near Mammoth Cave Park City, KY 14 nights (visiting friends)
291 miles to 5th stop Horseshoe Lakes, Clinton, IN 5 nights
265 miles to 6th stop Shady Creek Park, Davenport, IA 3 nights
177 miles to 7th stop Des Moines, IA area (wife wants to see bridges of Madison County) Prairie Flower Rec 5 nights
132 miles to Forest City, IA (home of Winnebago Industries)
Don't know yet when or route to get back home. This is the sleepyiest route and lowest cost camping I could find.
Hope it helps!
Roy & Lois