Im in Grayson country area, about an hour away but I wheel at The Wishbone Ranch in Bowling Green quite a bit. Itd be an easy drive down the Natcher for you Owensboro guys. I see everything from pretty mild builds to all out rigs on tons and 40s there. Lockers would be your friend if you really want to enjoy the wilder areas of the park though, its mostly rocks.
Old pic of my rig coming down the Waterfall bypass:
They host rides on certain weekends, and the guy that owns it is super cool. I usually load up and head down on Friday and camp out of the Jeep there for the weekend. They have a website: www.thewbr.com