Looking at the photos, my first thought was: where are the jacks? These are heavy, heavy vehicles. There's a jack on the overturned truck, and a jack on the second tour truck. With a few short lumber scraps, these would help to stabilize the vehicle -- at least on one side of the box -- so that rescuers could take some of the crushing pressure off the people who are trapped, and allow careful digging under the survivors, facilitating some very cautious and careful extrication.