WAS REVERSING WITH MY SMALL BOAT ATTACHED AT THE LAKE PRIOR TO LAUNCHING. PUT JEEP IN PARK TO STEP OUT AND CHECK HOW MUCH ROOM I HAD. VEHICLE CONTINUED TO REVERSE, KNOCKING ME UNDERNEATH THE OPEN DRIVERS DOOR. STOPPED WHEN IT HIT A TREE ABOUT 10 FEET AWAY. I HAD FRONT TIRE MARK ON MY BACK, PRETTY SCRATCHED UP AND BRUISED, PULLED MUSCLES ETC. VISITED THE DOCTOR FOR A CHECK-UP.