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I did alot of research before I bought this ladder. None of the others I researched would fit the transom of a 15 footer. The wood location is the problem. There is none. This unit has standoffs so no holes were needed to be drilled in the transom. I glued(with 5200) a polished alum plate to the top of the transom and screwed the top brackets on the ladder into that. All the forces of the weight are down force. It only cost $80

http://www.ebay.com/usr/northstarmari...7675.l2559