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Kim -

For a boat of the size and weight of the Montauk, a 15" tire is not necessary. There is a point where added width increases resistance (heat) and the ride gets stiffer.

A full service tire center should be able to offer the various brands. Online dealers are also price competitive.

Temperature ratings- With further research it appears this is for only vehicle tires and not trailers. See: https://recstuff.com/pro-tips/trailer...explained/