i dont have those kinds of problems storing my boat in the winter, but dave, why not go extreme? if storing the boat on concrete, get some climbing anchors ( http://www.climbhigh5.com/Climbing/Bolts___Anchors/Fixe_Glue-in_Anchor/fixe_glue-in_anchor.html ) and some chains, this system should do it, some might say its over kill, but your boat sure as hell wont be going anywhere. if you store it out on the grass, i dont know if you could anchor it down very securely