Sounds to me like you are not running enough air pressure for the weight on your rear duals. If the air pressure is too low it wears the outer treads of each tire, and if the pressure is too high, it wears the center tread of each tire. Be sure you are running the right pressure for your current rear weight.
Let us know what the service center determines your problem to be.
Good luck - Glenn
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2004 Safari 31SBD TREK W-20
McKinney, Texas
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