Last week this happened when operating the slide hitch when getting ready to come home from wherever they were.
Looks like the same truck in another dropped thread some years ago. Some one had vandalized his hitch while in a interstate rest area. As he accelerated away the trailer landed on the bed and on out through the tail gate and onto the on ramp. Had nothing to do with hitching procedures or the owners age.
Regardless of any of the reasons a 5th wheel trailer can land on the trucks bed a Bedsaver or Butch's safety pin is a good investment.
Lots of hypocritical comments being made about the victem when we have no idea of the circumstances.