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Dave it is good to hear that so far you are happy with your 637's. My guess is that they probably have a two to one weight over most of the tires that Keystone puts on our units. The ones I saw on the Landmarks looked to be very heavy duty. I would suspect that the 637's and GY's 614's both make our units handle better. Probably most noticeable in windy conditions and rough roads.
Tom Marty
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