Make a Pair of Bunk Glides for Your Boat Trailer - Instructables. It would be easier if my trailer had rollers, which it doesn't - it has carpeted bunks. Plastic or composite decking boards often have embedded minerals, which .. Contact US Boat Trailer Bunk Replacement - YouTube.
As for using decking to make decoy keels do be aware that the majority of composite and PVC decking is neutrally bouyant meaning it will not "sink". You do get the weight and the stability a keel provides but would still have to add weight to make the decoy self righting like is done when using a wooden keel.
I would screw the Seventrust to my existing 2x4 bunks for continuous backing. But you would have to do that with any of these composite boards. And given that the bunks are in the water for just a few minutes at a time, and sheltered from the sun and rain by a boat the rest of the time seems like they would last forever.
Regular pine. That's what the bigger/better trailer manufactures use and recommend Myco . DON'T use the salt-treated lumber. The chemicals in it do not do well with the points they are bolted to the trailer; especially when they get wet and drip down the stanchions.
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