Didn't work on our FW, but did work on the trailer!
Due to the lack of really going anywhere lately, we haven't been camping at the lake(s) and so our boat has been sitting, waiting for us.
Last season, I had one board end float up off the trailer when I unloaded. So a couple weeks ago, I went and measured all my bunk boards so I could replace them and the carpet. Got everything built, and then had to wait for an open weekend where we didn't have something planned already (mostly working on the house....).
I went this past Sunday morning, dropped the boat off in the water, tied up to the property's dock, and proceeded to tear the old boards off. It didn't take much! Only had to cut 6 of the 10 bolts, the rest just gave up without much of a fight! It was definitely time!
Had to perform some rust maintenance (grinding, acid treatment, painting), but everything cleaned up well. Not too bad for a 21 yr old trailer!

I found out a couple years ago that Rustoleum makes an almost spot-on match for the FW blue used on our trailer. Rustoleum Navy Blue from Home Depot.
Having everything pre-built helped a lot! As soon as the paint dried, it all went together nicely. Turned out very nice!

I was also able to check on the condition of the frame rails and cross braces, and they all seem really good. No big rust areas like I would have expected. Last year before I put the boat away for the winter, I sprayed a bunch of Fluid Film into the frame rails at the drain holes. Coated it as much as I could. Hoping that helps in the life of the trailer.