The only experience I had with them was delivering new trailers to them at HQ/Training center in Nashville, about 10 years ago
A class that was "graduating" on a Friday was headed out from the building to their assigned tractors in the parking lot.
The line of about 25 guys, all rather sullen looking, each with a duffle bag had all the appearances of a group in prison. The only thing missing was the leg irons.
The ironic thing is that there are two correctional facilities not too far from the Nashville headquarters!
Watch towers,razor wire and guard dogs optional!lol