In particular, you want to rinse anywhere that a stainless steel component is in direct contact with aluminum (such as rivets on the mast). When stainless steel and aluminum are in direct contact and salt water is introduced, galvanic corrosion will occur which attacks the aluminum. The objective when rinsing the boat is to get all of the salt water out of each crevice where aluminum and stainless steel are touching one another.
The salt can also leave a hazy film all over the boat, so it's good to knock as much of this off as possible. The salt can also damage the sail by allowing corrosion to develop around the metal fittings (grommets, reinforcement plates, etc.), especially if the sails are put away wet. It's good to rinse the sails if possible, but always be sure you sails are put away dry.
For the trailer, if you're only dunking it in salt water once per year, then it's probably not a big deal, but the salt will break down the grease in your wheel bearings, so you should check them more frequently. Depending on the design/material of your trailer frame, the salt can also damage the trailer by rusting/corroding the frame, particularly if the salt water is trapped in the frame (i.e., if the frame is a "box" frame). It's a good idea to rinse the trailer with fresh water as well, or just avoid dunking it all together.
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