A customer picks up his order at Louie’s, a BBQ trailer in south Austin. (Photo ©Chris Wilkins/Texas BBQ Posse) Editor’s note: Louie’s has now moved to a new location in Buda, just south of Austin. Address and info is listed below. Louie’s, a trailer joint on South Congress, wasn’t on the itinerary for the Posse’s recent tour of Austin-area barbecue places. But then we met blogger Jason Salas at an early stop. He raved about Louie’s so we changed our plans. Order of street corn at Louie’s. (Photo ©Chris Wilkins/Texas BBQ Posse) We’re glad we did. Louie’s, run by Luis…