Get involved with a local 4x4 club and they will show you some places. In regards to telling you where to go it may be a little tough as many locations are not revealed openly or are on private land accessible only with permission.
This might be too far but I know of a bunch of trails up here around Chattanooga, TN. They range from mild to completely Wild! I know the guys of the local MUD club and they are great guys to get involved with.
Yeah the guys in the local group go to Morris Mt. for sure. I looked at the Morris Mt. website but didn't look for places to fish around there. Maybe there aren't any, I don't know. I'll have to investigate further.