There's a quick release coupling that you can see on the bottom left of the lifter. I reckon that plugs into a hyd power pack on the fire truck.To be truly "the most American", it would have to include a battery and electric motor (or a petrol motor) so the paramedic only has to push a button, not toil on the hydraulic pump. No offence to paramedics
I seem to recall keeping several, a couple of which actually contained film. You could open and show one with unused film and tell anyone who was curious that the others contained used film which would be exposed and ruined unless opened in a darkroom.and it was easy to throw in a time of need and being black helped..