Truck with cart movement

I’m trying to create a game with a truck and cart hanging behind it (I hope i’m describing it good). I’m having a difficult time getting the rotation right of the to vehicles, if it’s moves back. The other rotations are not very well either. The movement of the truck is down with the normal “on key down” events. I’m working with the _rotation to get the rotaion right. I’m stuck here, maybe i’m going the wrong way, can anybody take a look at the fla file , or tel me wich way to go?
The game is made for Flash 5.