I tied mine to the rear swim rail several times, but noticed that if I left it like that for a little while with rough water rocking the boat the swim rails got loose. It is a pain trying to reach up under the back deck to tighten the swim rails back down. Plus I figured if it was putting enough stress on the rails to loosen them, it probably isn't really good on the cap either. I started tying off to the jackplate in the rear. I have a manual plate, so I just loop the rope around the adjustment bolt on the side I am tying up.