Yes, it's the cooling systems I'd be concerned with. The running gear would be dry (and there isn't much on this boat anyway). I know there is galvanic corrosion in automobile cooling systems, different metals in an electrolyte - even fresh water is an electrolyte unless deionized, and antifreeze is somewhat conductive normally. I know when I buy it for the tig welder I have to buy the expensive non-conductive stuff. A major challenge for antifreeze producers is the anticorrosion package to protect against corrosion. RV/Marine pink has some, but maybe not much, guessing from the price.
But the question goes beyond winter layup - I'd want to fresh water flush the cooling system when the boat is left for any length of time, even floating. And if the answer is aluminum pencil anodes, then I assume I'd also want aluminum running gear anodes since they are electrically connected and should have the same galvanic potential.
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