Dallas Morning News colleague Michael Ainsworth was recently on assignment in Austin when he asked advice on which barbeque joint to visit on his way back to Dallas. I directed him to Franklin BBQ, a little place in Austin that's been generating big buzz lately on the Texas BBQ trail. Michael arrived at the auqa blue and white trailer located in a parking lot beside I-35 around 2pm on a Wednesday. They were about to close but still had brisket left. Franklins is a "til the meat runs" out place when it comes to a closing time. He messaged me…