Much of the Lincoln unit is owned by Weyerhaeuser and they don't allow camping, and most of their roads will probably be gated anyway. There are a couple of large blocks of state land, managed by the Department of Natural Resources that you may be able to find a spot to park your trailer. I would try taking Deep Creek Road in which is off of Bunker Creek Road in the southeastern part of the unit. There ought to be some wide spots in there that would be big enough to get your trailer off the road. If I get a chance maybe I'll take a drive down there and check it out for you. It's only about 20 minutes from here.