I will check my wagon, but this looks like a very rare situation. The only thing that occurs to me is that the vehicle was grossly overweighted with cargo and abused at the same time. Definately not a normal occurance.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K