I was reading my trailer manual and it recommended a tie down (straight down from bow eye to trailer tongue....in addition to the normal crank line that pulls forward and your safety chain). I have never seen anyone do this but was thinking about doing it since the manual advises it. I can lift my bow up (even when the forward crank line is tight) so the down tie would make it more stable. It has trailered well so far on 3 trips of about 4 hours. They sell some bow tie downs for this purpose in Overtons. Thoughts? Any experience with these or problems from lack of one? THANKS