Quote:
Originally Posted by BigLew
Four by is over kill. Hemlock may not take kindly to the through-bolting to the U-brackets. Three by or doubled two by is more than sufficient. If you want you can sleeve the through bolts.
Talk to a trailer manufacturer and see what they use. Just ask questions, they'll answer and then you will know what the pros use.
It's 20' and probably less than 4500# loaded and soaking wet, and hopefully with keel rollers.
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Four by is over kill but the purpose of the wider board is so that it spreads out the contact to the bottom of the boat surface. The wider it is the less load that is being applied to the bottom of the boat in that area. The more you can spread the load out the better it is on the hull,