Re: Pontoon Trailer Bow Stop
If you're going to be replacing that stop, I would strongly suggest you going to a boat dealership and see what current model pontoon trailers are using.
Then, have a welding shop fabricate a copy of what looks good.
My trailer has two one foot long carpeted bolsters mounted vertically--about 24" apart. When I come into steep or shallow boat ramps, my boat doesn't go up under or over the bumpers. They're doing their job every time.