WHILE IN PARK VEHICLE ROLLED BACKWARDS DOWN INCLINE ALMOST STRIKING PERSON AT BOTTOM OF DRIVEWAY LUCKILY HE JUMPED OUT OF THE WAY AND IT STRUCK SIDE OF HIS TRUCK CAUSING DAMAGE, DRIVEWAY HAD BEEN SNOW COVERED BUT CLEARED DOWN TO ASPHALT, HAD BEEN PARKED APPROXIMATELY 10-15 MINUTES PRIOR TO THIS HAPPENING . THIS HAS SINCE OCCURRED MULTIPLE TIMES IN VARYING WEATHER CONDITIONS, INCLUDING RAINY, SNOWY, AND SUNNY WITH DRY PAVEMENT. THE VEHICLE HAS ROLLED FORWARD AND BACK, WITH AND WITHOUT THE PARKING BRAKE SET, WHICH THE PARKING BRAKE IT TAKES LONGER AND ROLLS SLOWER; EACH TIME THERE AFTER STRIKING VEHICLE PARKED CLOSELY AS A PRECAUTION, WHEELS GET CHOCKED NOW WHEN PARKED ON INCLINE TO PREVENT SUV FROM ROLLING. FORD HAS CHECKED MULTIPLE TIMES AND NOT FOUND ANY ISSUES AND FIXED OR REPLACED NOTHING SAYING IT IS BECAUSE OF THE REAR DIFFERENTIAL NOT A CONTAINING LIMITED SLIP GEARING. *TR