pontoon trailers - Bunk Bracksts
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Pontoon Trailer Bunk Brackets

pontoon trailer bunk brackets
Manufacturers use differing styles of bunk brackets. Some brackets are thick steel formed to shape. Others are pieces of stamped steel. The strength is in the base where the two pieces of steel that support the brackets come together. The reason strength of the bracket is important is because the majority of people who trailer pontoons do not secure their pontoon boat to the frame. A 3000 lb. pontoon bouncing up and down on weak brackets will stress them in a short time.
pontoon trailer bunk bracketbracket for pontoon trailerAlmost as important as the strength of the bracket is how it’s attached to the trailer frame. Attached to the main trailer frame is the strongest method, but some manufacturers don’t have wide enough frames.

Bunk brackets attached directly to the pontoon trailer main frame cross members are the strongest. The weight of the boat is carried on the cross member, not on some piece of steel welded onto the outside of the frame. More brackets distribute the weight of the pontoon boat evenly along the length of the frame. The more brackets the better.
The reason that more companies don’t bolt the bracket to their main frame is because the width of their frame is narrow. To get the bunk brackets out to 77” for the modern pontoons they weld on pieces of steel to extend the width of their frame. Other manufacturers don’t have enough cross braces. They can’t use more bunk supports because they don’t have anything (cross members) to attach them to.
pontoon trailer bunk support brackets
Some Brackets are supported by a piece of steel welded to the frame.
welded pontoon trailer bunk bracket welded bunk support bracket 
This bracket is attached to 2” x 2” steel that’s
welded across the top of the frame. 
Welded to the frame is a strong way. But on a trailer with welded bunk brackets, you can only use that trailer for the boat it is built for. 
weak pontoon trailer bunk bracket Only one brand of pontoon trailers uses the weak bracket shown to the left. The benefit (to a marine dealer) is that it’s easily adjusted. It just takes minutes for the dealer to set up and adjust the brackets for any size pontoon. But will it support a modern pontoon with a large outboard or I/O engine? The only place that you’ll see this type of bunk support bracket is on small fishing boat trailers. Their brackets are probably just fine for 600 lb. fishing boats, but I question its use on a modern pontoon boat especially one with a larger engine.
adjustable bunk bracket Here’s another heavier duty adjustable bunk bracket. This has large bolts with serrated lock washers, but the weight of your center tube rides on the friction of the two nuts to the bolt. It makes it easy for the marine dealer to adjust the trailer. Again the benefit is to the marine dealer in adjusting the trailer. There is no benefit to the consumer of having the tube ride on two nuts with serrated edges. You may have to recheck and retighten those every time you travel.
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