I’m with Bob on this one and always unplug the shore power when I leave CaSam.
    The first winter i left her plugged in my anodes “dissapeared” within months….not sure if this was me or simply a surrounding boat but since then I have never had a problem!
    I also close all seacocks below the water line from a safety point of view, although i have heard stories of above water line outlets that have been left open being used for flying insect nesting!