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Well, I go the "Mighty Wheel" jack - but haven't installed it yet as the boat is in Maine and I am not. The jack is a very nicely-made unit, heavy construction with a corrosion-resistant coating. It also has a zerk on the lift tube, which I had not seen before. While still hard plastic, the wheel is 8" diameter and 4" wide, so I am guessing it will roll pretty well.

Although admittedly without having installed it, I would recommend this jack just based on the look of the construction. Outstanding price too.