Download the RVPARKY app. Great tool to find parks along your route. Question is how long a day do you want to put in behind the wheel? Half way is about Cincinnati and a 7 hour day pulling a trailer traffic permitting from Harrison. (used to live in Davison). South of Cincy in KY are a couple acceptable choices right off 75 so leave early and push the first day hard. OR, overnight at Wapakoneta KOA. That would give you enough time to go see the Neil Armstrong museum right by the exit. Then next day stay at Indian Mountain State Park in Jellico, nice small park with good facilities.
We live about 25 miles outside of Pigeon Forge now so any questions you have just ask. Been here 8 years and haven't looked back. Don't miss Michigan one bit.