I did not want to drill any holes into the trailer cross brace [channel iron] so I used u-bolts to go around the channel.
I drilled holes in the 4" x 4" to match where I wanted to mount the boards. I counter sunk a loager size holes in the boards so nothing sticks out above the boards. Holes need to be big enough so that a socket will fit to tighten the nuts. I put a washer on before putting the nut. After all the boards were adjusted to support the boat weight evenly......I filled the holes with grease before putting on the carpet.
I went to the boat launch to take the boat off the trailer to do some of the work.
I used all galvanized material.
Don't forget.....the boards will have to be "adjusted" to evenly support the boat. You do not want to only have one end of the board holding up the boat.
If you need picture.....I can take some.
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