I have a 1997 Princecraft 196 19.5' aluminum fishing/pleasure boat. The
trailer is showing a tremendous amount of rust. I suspect the rust may be
due to my launching it in sal****er a few times. However, every time I did
that I dumped the trailer in freshwater very soon afterwards.

Anyways... There's a lot of rust on the outside of the trailer. I can't see
inside the trailer shafts but I imagine there's rust in there as well. What
to do? Grind the rust off and use POR 15 or something? Or replace trailer?

If I replace trailer are there generic trailers for 20' boats or do I have
to get it from the manufacturer?

Any help will be appreciated. Thanks.