There's nothing real good out there, some good places to go do a little back country driving. lots of "maintained" county roads that can get ruff. The sandhills state forest has a lot of sandy roads but there well groomed for the most part. I haven't been there but once so i didn't get to a lot of exploring but i wouldn't expect to find much. If I ever get my truck done I'm going to find some more "good" roads. There's a few by my house but you have to watch out because a few bad apples pissed of some people and a lot of the roads have side trails that look fun but could get you in trouble.
I usually just look on google maps and try and spot some good roads from that. In short you would probably have more fun in your cummins than your crawler.