I did the trip Cincinnati to Cleveland in 2018. I did the trip in 3 and half days. First night I camped in London- there are free trailside campsites for cyclists. Next night I camped in Glemont at a public park. My last night I slept at a scenic rail station in the Cuyahoga National recreation area near Cleveland. The entire trip is 326 miles so I probably averaged close to 90 miles per day. For the most part any grade changes are not discernible because most of the route following rail trail or canal towpath. The off trail section between Fredericksburg and Dalton is hilly but not difficult. There are several camping areas along the way- i.e. state parks- but you may have to travel several miles from the trail. If you don't mind stealth camping, there are a lot of possibilities.