The wheelman on a barbecue tour needs thick skin and quick reflexes. During a 240-mile trip from Dallas through East Texas on a recent Saturday, our driver had both. Moments after getting needled for poking along at 50 in a 70 mph zone, David Woo quickly had his car at the speed limit. Then we spotted smoke coming from a portable smoker in front of a low building. We were headed east on State Highway 31, between Tyler and Kilgore, about 115 miles from Dallas. “That looks interesting,” one posse member said. “Let’s go back.” Woo, a photographer at The…