This is a job I gotta do someday soon too. Not looking forward to it. Not even sure HOW TO DO IT!
I have a 27ft flatbed trailer that I originally bought to move with. I put stake sides on it and used it as a moving van and equipment hauler. It easily paid for itself many times over.
Mine is similar to this but has a 4ft beavertail and the ramps slide into pockets under the deck instead of standing up on hinges.
View attachment 48668
The pressure treated wood deck is rotting and needs to be replaced.
The screws appear to be self tapping. Getting the screws on new boards to line up with the old holes seems like mission impossible. New holes would only accelerate corrosion on the old holes. Corrosion on this trailer is already a big problem.
Ya, a job from Hell.