I worked at a heavy truck repair shop for over a year and a half and never saw that. They always pulled the driveshaft and then reinstalled it when they got to the shop.
Been in the HD field for over 25 years and have seen all the different methods. I wish the tow truck drivers would have pull the driveshaft and reinstalled after drop off, would have made my life a lot easier. Putting axles in is an easy task, as well as taking out, that's probably why the drivers do it that way, never really asked.