I have an aluminum trailer. Is there anything I can spray on the
hardware (like WD-40) to help protect it?

I used to own SeaDoos and they had an engine spray that would coat the
engine to protect it from the elements. Is there something similar for
my Yamaha outboard? Is it wise to do this? As soon as I get the
manual for my motor, I'll read up on it.

I plan to go off-shore and will need a radio to communicate in the
event of an emergency or whatever else, but primarily for emergencies.
I'm thinking a handheld. Any thoughts? I would mostly use it out
about 1 - 25 miles off shore. I live in central FL. Or is there an
alternative?

TIA!