Wheels up this morning at 6:30 a.m. from Posse pitmaster Marshall Cooper's driveway in North Dallas. Our first destination was breakfast at Snow's BBQ in Lexington, which has become a ritual for us when starting a tour in central Texas. To be followed by four more joints and 500-plus miles on the Texas BBQ Trail. Anticipation was building as we approached the Lexington city limits. The speed limit dropped from 65 to 55mph, but no one noticed. We were talking Snow's and what we would order for breakfast. No one except one of Lexington's finest, running radar less than a…