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  1. quickfarms

    5th wheel pin sizes

    There are two different size king pins. 2" and 3.5" The 2" is for normal trailers and allows a GVW of 80K The 3.5"'is for overweight or heavy haul. The diameter refers to the small diameter. The king pins need to be checked for wear periodically. There is a special wear gauge. The wear can...
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