I agree that it's sad, but if the guy is on his own time (lunch) and is locked in the back of his truck, who cares what he's doing to himself? The only thing that could be an issue is keeping the porn in his truck on company time after his lunch or if he got bodily fluid on the truck.
I think there is more background there between that driver and sup situation. If my sup received a report of my truck sitting in a parking lot for an hour he wouldn't be out there opening the door. He'd say, thanks but our drivers get an hour lunch...unless there was some issue with the driver stealing time/falsifying, etc.