I used regular plywood on my 4 place trailer 8 years ago and have to replace it. One of my friends used marine grade on his trailer 10 years ago and it's still solid. We both used ski guides, and I put track mats down as well. The sad part is the plywood started to rot in an exposed area, under the guides and mats it still looks new. I treated it with deck stain before I installed it as well.
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