I run a 40ft tri-axle dump chassis. I can load and dump a 20 ft container. I dump on a concrete pad pull out just enough to clear the pile. Get out the truck and as the body is coming down Clean off the tail and shut the doors. If the outfit I work/haul for saw me drive off like that. I'd be fired.
Quite obviously this is a company driver. An owner / operator would know the value of the lift cylinder seals and NEVER move the unit unless the bed was laying down on the frame. Rookie!!!