There was a thread on here somewhere talking about how all benzes apart from the w115/4 were desigend to have some body roll to address this issue that creeped up on them.
Instead of popping tires off the beads, they decided to have the cars roll a bit.
It would be safe to say that MB sedans are supposed to roll, not remain extremely firm and 'biff' it.

I am not sure where the thread was...I think it was a 300SD handling thread...I will see if I can find if for ya.

Brandon