Two other things: 1) There's not a lot of clearance between the top of the tire and the bottom of the pontoon. If you plan on carrying much weight in the boat while towing, you might want to replace the 2x4s with 2x6s.I'd suggest heavy, pressure treated wood, or the trailer will tend to float without the boat on it. Replacement is easily done after launching the boat. 2) The boat will re-load onto the trailer much easier if you connect the 2 guiding 2x4s on the sides, at the top, with a 2x4 or 2x6, carpeted
Two other things: 1) There's not a lot of clearance between the top of the tire and the bottom of the pontoon. If you plan on carrying much weight in the boat while towing, you might want to replace the 2x4s with 2x6s.I'd suggest heavy, pressure treated wood, or the trailer will tend to float without the boat on it. Replacement is easily done after launching the boat. 2) The boat will re-load onto the trailer much easier if you connect the 2 guiding 2x4s on the sides, at the top, with a 2x4 or 2x6, carpeted