A customer waits for his order at Fatboy's BBQ in Cooper. (Photo ©Chris Wilkins/Texas BBQ Posse) You meet some great folks as you travel the blue highways of Texas BBQ. Shannon Bankston and Heather Hoff of Fatboy's BBQ in Cooper are those kind of people. A year ago, Marshall Cooper and I met Shannon and Heather at Fatboy's, then located in the tiny town of Ladonia in northeast Texas. It was a slow day in the town of 613 residents, so we talked BBQ for half of the afternoon, which of course is one of our favorite things to do. Fatboy's had…