I talked to a Celadon driver who was in one. It was a special program that International had with several companies, Swift being one of them. They were testing a new engine so they offered the companies one or two on a dollar a year lease. Because of the testing the trucks had a lot of shop time. If they were the Phoenix to Dallas shuttle they never went further east than Lourdesburg NM. Test program is over, don't know what became of the trucks as the plan was to completely tear down the motor at the end.