About 14K on my 9500 lb fiver and no signs of trouble. I plan to grease them for the first time this weekend.
Could be they weren't adjusted correctly at the factory. Too loose would cause premature wear. And it could be your dealer was looking for work. 
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2015 Ford F-350 XLT Ruby Red 6.7L Powerstroke, 4x4, Short Bed, Andersen Ultimate Hitch
Cougar High Country 299RKS, Mor/Ryde pin box, 200w solar
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