Well you have Tellico...but that's more SE NC...and I think it's temporarily closed. Dammit...I know there's a site I go to alot that has a break down of any public/OHV trail in the country, can't find it right now, but I'll get back to you.
You know what...you said NE NC...and I wasn't even paying attention, and Tellico is the opposite corner...haha. Here's a link to some documented trails, still not really the area you're looking for though: