My wife went to back out of our driveway. She was on the side of the driveway in some stones. She put the F150 into 4 Wheel High which she has done numerous times. She shifted the truck into reverse with her foot on the brake and the truck accelerated and hit a tree 10' away from the rear of the truck, The truck has been taken for evaluation. I have to report my truck accelerated on its own. I called Ford Motor twice and was on hold for an hour with no luck. There were no warnings at all on the dash. Insurance Adjuster looked at it and told me to have it towed the the body shop for further evaluation. My wife was hurt and a contractor was standing in the are near the tree. The Truck is now at SJM Auto in Sugarloaf PA