My old bow and stern tie down ropes are getting a bit worn. And, when I bought them over ten years ago, I just selected ropes that felt like the right weight and held a knot - I didn't really do much research on what would be the best rope for the application. So... What specific type of rope and weight/thickness of rope do you folks recommend for bow and stern tie downs? what material? "static" or "dynamic"? are the premium rope materials worth it for tie down ropes? BTW - I have some of those ratcheting tie downs that came with my Thule rack - but I really like the simplicity of plain rope for the bow/stern tie down application.