In my experience it's not typical for the SLK 200 to have poor rear end stability, quite the opposite. The rear end can be encouraged to let go, but under normal driving should not hang the tail out at all. I suggest you get the car into workshop and have the suspension checked out. Sounds like something is amiss.Thanks for the input and yes rear wheel drive is the only way
Unfortunately this is a bit more than that, I have driven rear wheel drives for many years merc's and currently a 5 series. This is my wife's car and she is now quiet nervous.