I finally got up the nerve to go ask Cooper's about their food and was pleasantly surprised to learn that their BBQ is indeed GF. They use a safe vinegar and none of the other ingredients on their pork BBQ or BBQ chicken contains gluten. Obviously you will need to stay away from the hush puppies and fries (not a dedicated fryer). Some of their sides are also GF - Collard Greens, Steamed Cabbage, Corn & Butter beans (I call these lima beans), Boiled Potatoes and Potato Salad.
Cooper's is located in Downtown Raleigh at 109 East Davie Street (1 block east of Fayetteville Street) and is open Monday - Saturday from 10am - 6pm. Cooper's phone number is 919-832-7614 if you want to call and ask them questions about their menu.