Looks like this place is below the DBBB, but has some cool trails. I have always seen video of the one they call the car hauler, which is actually an old car hauler they used as a bridge.
https://www.rockyour4x4.com/?p=48
https://www.google.com/maps/place/P...6666f0f94a2f32!8m2!3d36.5512241!4d-84.7966758
https://www.rockyour4x4.com/?p=48
https://www.google.com/maps/place/P...6666f0f94a2f32!8m2!3d36.5512241!4d-84.7966758