Not sure which way you are going, but if you are doing I75 there's a book you can buy that gives exit by exit amenities and history along the route.
When we drove it pulling the RV we stayed at the KOA in Bowling Green and toured the Corvette museum, we also stopped at the original KFC and the Kentucky Horse Farm, all are RV friendly with good parking.
We stayed in Georgia at a place called Agrorama, its basically a parking lot with full hookups for $20 a night. Short drive to Fort Wilderness from there.
Lots of truck stops and Walmarts along the way for overnights as well.
Be careful not to get in the wrong lane going thru Atlanta!!!
(don't ask)
Mike