I used to have an H16 when I was living in Indiana. We frequently had strong sustained and gusting winds. Those thunderstorms and tornadoes tend to do that...

Anyway, I never had an issue with the boat moving at all while being stored. In the winter I would remove the tramp and rigging but leave the boat uncovered. I also never tied the boat/trailer combo down. In three years the boat/trailer never moved in strong winds.

The only time I ever had an issue with a boat blowing around in storage was when I was in Burlington, VT on a camping trip. We kept the boats (TheMightyHobie18's) on the beach all week with the masts up and the jibs furled. We had a really bad storm and my boat blew over. My buddy's boat was fine.

You never know.