seeking overnight stop on I-65 southern ky, nothern TN

On the KOA site, it shows a 30 amp site for $35.43 base rate. Sometimes if you can get buy with back ins or 30 amp the KOA's do have cheaper sites.
There is a KOA in Franklin but it doesn't get as good reviews as the Bowling Green one. There is Beech Bend campground a few miles off I-65 but they are first come first served and don't take reservations. Not much around Bowling Green to choose from.