We stayed at the KOA in Clarksville, Indiana, just across the river from Louisville. Full hook-ups. Spaces a little tight, but enough room you can get your slides and awning out. We stayed there 3 nights to attend the Barry Manalow concert this last Spring. The campground was more than adequate, especially since we just wanted somewhere to park so we could run around, and then had our own bed at night. The campground was clean, neat, well maintained, and the owners took a lot of pride in it. I'd go there again if ever in the area. It's open all year round and has water all year too.
I suggest making a reservation right now! For an event like that, they might even already be booked solid! Plan ahead! now!