Ok, full disclosure, I did not use this for it’s intended purpose. However, I did use it for a PDR project on my vehicle and it worked great! I attached this to a homemade pull tower with a few shackles and D-Rings. This worked perfectly. Slow hand cranks little by little allowed me to hold position and relieve some stress on metal with a knockdown, etc. (I am not a professional at all. Just own an old truck with a a few dents and a lot of YouTube. Great product. Not sure about a boat, so no comment on that, but it works for me on other applications.