Securing Your Boat on the Trailer
Keep in mind that when you’re barreling down the highway at speeds of 65 mph or more, the boat will be buffeted by near hurricane force winds. Anything loose on the deck or in the cockpit, including things like biminis, will probably be blown away. Either stow them below or make sure they are secured. Better yet, wrap the boat in a snug-fitting cover, which protects the upholstery from sunlight and road grit, as well as reduces fuel consumption.
A heavy strap should always be used to anchor the boat's stern to the trailer. If a strap isn't used, the boat will bounce against (or off) the trailer. Don't rely solely on the winch cable to tie down the bow. Use a separate line from the bow eye down to the trailer. When you're traveling, check the straps and the bow eye itself whenever you stop.
Thanks to Seaworthy Magazine