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Few things
Some people put WD40 on them to protect them. Personally I don't think that's a very good idea but They said it wears off very quickly as its not really a lubricant.

Second is rinse will salt away. Awesome stuff.

Third. Jack the front of the trailer WAY down. Put some blocks on the back and jack it back up. This will take the tires off the ground so every few weeks you can kick the tires and keep them moving. Also keeping them off the ground will reduce flat spots and if stored in the grass keep them from rotting out. Also good for the springs if you keep the boat on it but be careful with the boat on it to make sure you are not overloading the jack.

Now I live in Chicago so only the road salt I have to deal with as I boat all winter and also a few trips to FL if I'm lucky but I did a ton of research so I don't destroy my trailers.