Safety dictates using tie-down straps when towing your boat with a trailer. But the thing that protects your boat can also cause some damage to your boat. Flat, woven trailer tie-downs often generate “lift” from the air passing over them at highways speeds. This causes them to vibrate and chafe, scuffing your boat’s finish. Prevent the vibe by disrupting the airflow: Simply put a twist in those straps before securing.