Are you on Facebook? There is a group named Texas Overland and they have all sorts of backroads and routes in their file section.
As far as wheeling, CoolMax is right. There are only 2 parks close by, Barnwell Mountain in Gilmer, TX and Northwest OHV in Bridgeport.
Northwest OHV is old rock quarry turned park, run by the city of Bridgeport. For me, it's a good place to go waste a morning or day with friends wheeling.
I like Barnwell Mountain better, as it offers a bigger park with a more diverse set of trails. They also tend to maintain the trail system better.
Barnwell Mountain
Northwest OHV