Bob,
That was a concern right up to the day I put the boat on the trailer! Believe me when I say unknown's bug the heck out of me and that was a doozie. I will make an attempt to get you the info you need later today.
I will tell you that the more important measurement is where the dead rise of the bow is in relation to the cross brace (c) in the front of the trailer. Too close and the bouce of the boat on the trailer will bang the keel into the cross bar. To my way of thinking, that is more important than the overall length.
The winch post can be adjusted for height and for setback. I used pressure treated 4x6 for the bunks which added to the complexity of height and length. I adjusted both after the boat was on the trailer. The reason I mentioned the cross piece is because I initially moved the winch stand too far forward. I had wanted to minimize the amount the boat hung off the stern, but by doing so I pulled the hull too far forward. A simple fix; I just need to pull the boat to the rear of the trailer but initially it wasn't on my radar.
I just need to move the hull back six inches. I believe you can see the paint line where the winch post was originally located.
I had originally planned on cutting the ends off depending on how far forward the keel sat in relation to the winch stand. Turned out that they were the ideal length.
I had initially wanted the transom as close to the rear of the trailer as possible because the bunks cantilever about two feet past the cross member.
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