Most ­boat-trailer jacks are operated manually. The boater cranks the handle to move the jack up and down and raise or lower the boat. Other jacks are available today that work ­using an electric ...

Related:Ever Heard of V-Drive for 4x4 Vans? The Tauler Jack comes as a kit with CNC laser-cut components that you weld onto a trailer jack that you source. Once built, this jack has a 15-inch ...