Guess I found the cause?

Can they get any worse than this?

Last time I looked it was just a small hairline crack probably 18mo ago...seems it has worsened since then...

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

I think you've seen the ones I removed from my car...they didn't even look as bad as yours from the outside! At least one of those looks like the core of the bushing has twisted.

Before I replaced mine...it sometimes felt like one of the rear wheels was wobbling when going around a corner, the car was also wandering like crazy above 60mph.

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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...

I definitely have wandering, especially when going over drains in the road, the rear end wants to go off on its own...

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k