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Too much caster can cause a violent shake after hitting a big bump at speed ie railroad tracks or potholes. 5 deg might work on a tabletop smooth track but I wouldn't want it on the street.
Kevin
That's strange mercedes all have 5-7 degrees of caster. Mercedes owners are some of the pickest drivers in the world. Why would Mercedes do something so dumb? 
But I will say that too much can make it very hard to adjust camber and toe. To the point you have to adjust them at the same time, if you change one angle, it tends to change the other specs at the same time. Then again it could just the way the mercedes has the mounting points on upper and lower control arms. 
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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