Trailer Choir will perform a free concert at a NASCAR Sprint Cup Series race at Dover International Speedway in Delaware on Sunday (Sept. 27). In addition to a 10 a.m. concert, they will also sing the national anthem before the AAA 400 at 2 p.m. Trailer Choir's current single is "Rockin' the Beer Gut." The trio released a six-song EP, Off the Hillbilly Hook on Show Dog Records in June.