For the new bunks I used pressure treated 2x4's that were twelve feet long cut down to the length of the original bunks which were around 11ft long. I used stainless bolts to affix them to the mounting plates I welded on the trailer. Once I had the bunks bolted down a leveled out well I screwed pieces of the trek decking on top of them that the boat will sit on. This stuff is pretty slick allowing the boat to unload easily, a friend of mine with a mud boat did his bunks with it. I liked it enough I decided to use it as well. The benefits are it won't rot, and it won't hold moisture like carpet does so the wooden bunks should last longer. The wood is pressure treated now so it should last much longer than the previous bunks. Pressure treated lumber normally causes corrosion issues when in contact with aluminum, but the boat will be contact with the trek so it shouldn't be an issue. I bought three 8ft pieces of the 4" wide gray trek it was the cheapest that's why I used it. I ripped each piece in half down the middle long ways to make thinner strips that covered the tops of the 2x4 wooden bunks perfectly. I used a table saw to rip them down, it cut about the same as wood does just had to go a little slower while making the cuts due to the trek being denser than wood. I screwed down the trek pieces using stainless deck screws. I counter sunk all the screws into the trek so they wouldn't scratch the bottom of the hull.
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why does everything have to get in the way of fishing and hunting?