STOPPED ON ROADWAY TO PICK UP A PART THAT HAD FALLEN OUT OF THE TRUCK TRAVELING IN FRONT OF ME. I PUT MY 1998 CHEVY SUBURBAN IN PARK AND POPPED THE REAR HATCH. I REMEMBER HEARING THE REAR HATCH CLICK AND NOW REALIZE THAT THE HATCH WON'T RELEASE UNLESS THE TRUCK IS IN PARK. I WALKED BEHIND MY TRUCK TO PICK UP THE PART. AFTER I PICKED IT UP, I WAS KNOCKED DOWN BY THE FORCE OF MY TRUCK. THE TRUCK MUST HAVE SLIPPED OUT OF GEAR AFTER I'D PUT IT IN PARK. I RECENTLY READ ABOUT A SIMILAR INCIDENT IN THE LOCAL NEWSPAPER, WHERE THIS HAPPENED TO SOMEONE ELSE WITH THIS TYPE OF VEHICLE. THE TRUCK ROLLED OVER ME, AND I WAS TRAPPED UNDER IT. A MAN CAME AND DROVE THE TRUCK OFF ME. I SUFFERED A DEEP CUT TO THE BACK OF MY HEAD, THE MEAT WAS RIPPED OFF MY LEG, I SHATTERED THE T-12 VERTEBRA IN MY BACK AND THE DISKS ABOVE AND BELOW WERE COMPRESSED.