My boat/trailer are celebrating their 30th birthday this year, and in general still going strong.
I've got, or had, the standard plastic carpet covered plywood steps on the fenders for getting in and out of the boat on the dry. Over the years they've become problematic, the biggest problem being the wood surrounding the fasteners rotting out and the board letting go. We've rescued a couple from the launch ramp when they floated off, thankfully none on the road! I've rebuilt and resecured them with scrap wood from my shop, reusing the old carpet. I've also tried various methods to resecure them with mixed results. I was chatting with a buddy and mentioned I needed to do a rebuild, no more half measures on them all. He suggested Trex, and I thought that was a great idea.
I visited a local lumber yard and turns out they had a scratch and dent pile of composite lumber for a heavy discount. I was able to find a nice light grey in a solid pvc so it would look nice when cut. I wire brushed some rust and did a quick spray paint of the mounting area before mounting. As you can see, I had to rip one piece down on the table saw to make it fit. It looks a little off, but I wanted to keep the rounded factory edges as much as possible so the only cut edge is against the trailer. I'm ok with function over form.
I did a little sanding to smooth the cut edges out and mounted. To secure them I used 1" cabinet screw (it's about an inch thick, so most I could go) and dipped all of the screws in high end adhesive/sealant before screwing in. I predrilled most and each board got 3 screws.
I'm hoping for many years of trouble free use now!