It’s imperative that you make sure the boat is tied down to the stands or blocks. When Hurricane Wilma came through several years ago, the wind blew so hard that a 58-foot Viking teetered on the jack stands at her aft corners; I saw it happen. The boat was moving around so much that, at times, it would separate completely from the aft stands. There was no danger of her going over, because she was tied down to her haul-out cars and the 40-foot cement pilings laid out on the ground next to her, which had PVC pipe running through them for tie downs. However, watching that boat rise ever so slightly, and the stands shuddering under her, it was easy to see how a boat could fall off the stands if it were not secured to something else.