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Sounds like you've thought of most things to prepare. I've been through a few of the southern hemisphere equivalent on board and have found the two thing that cause the most damage in marinas are 1. Other boats that have not been adequately secured. As others have said put out as much external protections i.e fenders as you have but if your not on board there's not a lot more you can do about it. 2. Storm surge that will lift a marina finger up and over the piles. There are some marinas that have cyclone bars that go through the top of the piles to prevent them going over but they rarely remember to use them.
If its a cat 4 or more severe storm any soft coverings left outside wont survive.
Good luck.
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