ON 03/07/15 AT APPROXIMATELY 1715 AT TYLER STATE PARK OUR VEHICLE WAS BACKED INTO THE PARKING SPACE ON A SLIGHT INCLINE AT CABIN ONE. OUR 3 YEAR OLD DAUGHTER WAS IN OUR 2012 GMC ACADIA IN THE DRIVER SEAT AND OUR FRIEND'S 9 YEAR OLD SON WAS IN THE PASSENGER SEAT; WITH THE VEHICLE IN PARK THE IGNITION TURNED OFF AND THE KEYS IN MY HUSBAND POCKET. OUR 3 YEAR OLD DAUGHTER WAS ABLE TO GET THE VEHICLE OUT OF PARK AND INTO DRIVE, CAUSING THE VEHICLE TO ROLL FORWARD DOWN THE INCLINE, ACROSS THE STREET AND HITTING TWO TREES. THIS CAUSED DAMAGE TO THE BUMPER AND RIGHT QUARTER PANEL CAUSING THE PASSENGER DOOR TO CATCH ON THE METAL FRAME WHEN OPENING THE DOOR AND THE FRONT END OF VEHICLE SHAKES WHEN DRIVEN BETWEEN 65MPH-70 MPH. BOTH CHILDREN WERE OK WITH JUST BUMPS ON THEIR HEADS. I CALLED THE GM DEALER IN TYLER, TX AND WAS ADVISED BY [XXX] TO CONTACT A GM DEALER WHEN I RETURNED HOME SINCE THE VEHICLE WAS DRIVABLE AND WE WERE ON VACATION. ON MONDAY MARCH 16, 2015 AT APPROXIMATELY 0715 I CALLED TEXAN GMC AND SPOKE WITH [XXX] AND ADVISED HIM OF WHAT HAS HAPPENED WITH THE VEHICLE WHILE ON VACATION. [XXX] ADVISED ME I COULD BRING THE VEHICLE IN TO HAVE THE RECALLS FIXED BUT I WOULD NEED TO CALL GMC CUSTOMER SERVICE @ 800-222-1020 AND GET AND INCIDENT REPORT STARTED WITH THEM AND SEE WHEN THEY WOULD LIKE TO HAVE A TECHNICIAN TAKE A LOOK AT THE VEHICLE. I CALLED GMC SPOKE WITH [XXX] AND SHE GAVE ME A CLAIM #[XXX] I THEN TOOK THE VEHICLE TO HAVE DIAGNOSTIC TESTING DONE ON MONDAY 03/16015 AND WA