I STOPPED THE TRUCK AND PUT IN THE PARK POSITION, I THEN CAME OUT OF THE TRUCK, CLOSED THE DOOR AND THE TRUCK STARTED TO MOVE IN THE REVERSE DIRECTION, I RAN AFTER THE TRUCK TO SEE IF I COULD STOP IT BUT THE REVERSE SPEED WAS TO FAST FOR ME AND THE TRUCK HIT THE TREE DAMAGING THE REAR BUMPER AND I FELL BACK INJURING MY BACK. CHECKED THE POSITION OF THE SHIFT AFTER ABOVE INCIDENT TO SEE THE POINTER POSITION ABOVE "R". I TRIED SEVERAL TIMES TO DUPLICATE THE SAME SYMPTOM WITHOUT ANY SUCCESS. THIS I KNOW FOR CERTAIN YOU CAN NOT GET OUT OF THE TRUCK WHEN IT IS IN REVERSE. *JB