I don't think anything is tried and true when it comes to hurricanes. You can secure it to the trailer really good and tie it down to anchors in the ground at least 4 points (6 would be better, 2 additional for the trailer). The down side is this would work only for the wind factor. If the water comes up over the trailer enough to float the boat at some point this will rip out the anchors. I've seen this happen. The force caused by the bouyancy of the hulls is enormous if they submerge enough. One solution would be to leave the drain plugs out so the hulls could fill with water as the level rises. This would work if the water came up slowly.

JMO,

Clayton