In 15,000 miles of towing my coach across every type of road imaginable, I have not found a need to upgrade the king pin. I have found on the bumpy roads just slowing down a few miles per hour will usually take care of the harsh ride. I have not noticed any chucking or body roll that would cause me any concern or trouble. Maybe it is my Superglide's 4 way pivot head that takes care of it for me??
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