When in park my vehicle rolled backwards to the bottom of my driveway. i was able to make it happen multiple times. i was able to have my wife record it on video from both sides of the vehicle. it happened when parking partially on ice. the passenger rear tire turned against the roll of the vehicle. all 3 other tires rolled with the vehicle. my vehicle has the hemi 5.7l, 5 spd transmission, awd, and my shifter is not the dial type but a regular shifter type. is the passenger rear tire the only one that keeps the vehicle from rolling rearward while in park? i can provide the video evidence.