Steve, that is a hard question to answer. Dirt bikes could easily handle every trail I saw, but there were places that ATVs couldn't navigate, like steep hills.
There was very little single track, most everything was at least as wide as an ATV. And there were roads for 4x4s too, but thankfully, I didn't encounter any of those (except for the ones we saw that were stuck in the river! :p )
The trails were rather rutted and muddy (not long after a rain though), but there were very few rocks so that was a big plus. They have some really big hills there that were muddy and rutted, and that made for some tough going.
Trail marking was practically nonexistent and we got lost at one point...there are LOTS of places to ride up there. It certainly wasn't crowded; we only encountered 2 other dirt bikes while there.
I would go back, but if you go alone, try to find a GPS-equipped radio. :clue:
I see you're in Mooresville...I'm just outside of Salisbury...where do you normally ride?