When the water is out of the block, and any heater or shower lines, there is nothing left to freeze. If you put in antifreeze you are not adding to the freeze protection for your engine. Just saying ...
If you are worried about pockets of water somewhere you could just drive the boat around on the trailer to slosh out what might be there while you have the drains open. Up and down a couple hills and around some corners and you are good. My Canadian Mercruiser Scorpion has never touched antifreeze. It just sits empty for almost 10 months a year, since 2006.
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