If you are planing on RV parks,, See above and/or assorted apps for your smart phone like RV Parky and RV campground finder.
If you are just overnighting, there are a couple of Flying J-s (noisy but free) some Wal*marts, and such along the route, the apps mentioned above will find those too.. If you are a member of the MOOSE there is at least one MOOSE just off I-75 in KY that I stay at but..... It is a couple miles up a Ky "Side road" (KY side roads have no sides, just drop offs, sharp turns and nice mountain type hills) Not for the faint of heart in a full size RV.. I've stayed there often. But I take State Ridge Road nice and S*L*O*W!!!! Call ahead on a Friday or Sat night.
Home is where I park it!