THREE WORKERS WERE TRYING TO DUMP A TRUCK BED WITH A LHD & A LOADER. THEY LIFTED THE TRUCK BED ~2/3 UP & COULDN'T MOVE IT FURTHER. THEY DECIDED THEY WOULD BE ABLE TO GET THE TRUCK TO DUMP IF T HE DUMP LEVER WAS MOVED OUT OF NEUTRAL. AN EE CLIMBED ONTO THE TRUCK BUMPER TOWARD THE CAB AREA.THE LHD BUCKET SLIPPED OFF THE TRUCK BED & EE'S LEG WAS PINCHED BETWEEN LOADER TIRE & TRUCK CAB