I recommend buying those straps with a ratchet. You can find them at most hardware stores, and get four, one for each post. I haven't seen Jaime's rig, but I'm leery of bungy cords since they can get bouncy, and I'm not really good at tying tight with rope. Also, make sure you tie the boat down with the straps either all inside or all outside the posts on the hulls so the boat won't roll off.