How do you beat level 25 on vehicles

Drive the fire truck and the ambulance in the wheel but don't go to the top so it falls off. Then you click on the black and white bar holding the other ambulance. Next, it should fall on the other black and white bar click that too. Put it in drive and click the last black and white bar. It should roll the plank off the edge a little bit until the black car falls. when the black car hits the planks roll the tire off the edge completely and it should throw the black car off the edge!