I replaced the side bunks on my boat trailer. Howsclaw Trailer made in Evansville, IN back in the 1970's.
I did the same thing but I used a 12 volt to 115 V converter to power a air compressor and then used a pneumatic staple gun to put the marine carpet on the new boards. A portable drill to drill the new holes in the wood and then installed the new boards on the trailer while the boat was offloaded and parked along the shoreline near the ramp. Took me a while to setup and do the job. I used regular two by four wood.
Note: Treated wood is treated with arsenic compounds to keep insects at bay. I suggest using a water proofing liquid and brushing it onto the wood at home to water proof the wood. Or if you buy the wood make sure that when you ask for treated wood that you tell the salesman you man water proofing treatment on the wood not insect treatment. Maybe you can buy the insect treated type wood and then coat it with some Thompson's water proofing stuff. You want to keep the wood from rotting over time so that's why I water proofed it.
I got the marine carpet at Home Depot. Just used indoor/outdoor carpet.
For the bottom boards that the boat sits on I used some 12ft long 2x4's on Edge and put carpet on the top edge that the boat sits on. But the carpet was adding too much friction between the bottom of the boat and the carpet. So I added some plastic to the top of the board and now the boat slides off real easy. You can buy the plastic pads at Bass Pro Shop and screw them onto the top of the board ever 6 to 12".
https://www.basspro.com/shop/en/e-z-slide-trailer-pads




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