Anyone know the exact area to place jack and jack stands? I've seen the diagrams where there are middle spots in the front and one in the rear to lift the entire section up (never heard of that before) and then there are 4 areas between the tires to also place a jack. But those 4 spots seem to have an edge and its not a flat surface. I'm changing out tires and I've searched the internet but no one has an exact place. Anyone have pics? Thanks