I was there for the first time last weekend, I'll be going back.
You'll need trail leaders familiar with the area, they aren't marked at all. Rigs will need to be streetable because you're on the road between trailheads. Potential body damage on all the trails that I saw, there may others for stockish type rigs, I dunno.
Don't forget the Caves, my wife and daughter got as big a kick out of them as the trailriding.
Slade is on most Atlas maps, just not listed in the index, to small. It's right by Natural Bridge State Park, in the Red River Gorge area.
One more note; it was a perfect Fall day when we were there, if it rains I imagine most of the trails would get pretty nasty real quick. TC