Your average roll on ferry has loads of exposed moving mechanical joints. Just look at the loading ramps. http://s3.freefoto.com/images/2026/49/2026_49_11_web.j

Your average roll on ferry has loads of exposed moving mechanical joints. Just look at the loading ramps. http://s3.freefoto.com/images/2026/49/2026_49_11_web.jpg http://s3.freefoto.com/images/2026/49/2026_49_11_web.jpg