2010 Dodge Journey

Shakes or Wobbles problem
2010 Dodge Journey 6 cyl All Wheel Drive Automatic 7300 miles

I had my new journey, which I have only had for 3 months, serviced three times already. I think I have a lemon. Anyway the steering wheel was shaking really bad when I got to 50 or higher and the service departmant said I had mud in my wheels. But I live in the city I have only driven down a dirt road a few times so is that true or do you think the are lying to me. It is an all wheel drive so I just don't get it. Thank you.
October 1, 2010.

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