Here are three types of tongue jacks for today’s boat trailers. Swing Jacks. The Lift: Hand-crank jacks such as West Marine’s 1,500-pound-capacity swivel-mount model ($114.99; westmarine.com) bolt on ...

Use three Grade-5 1/2-inch bolts, washers and locknuts to secure the assembly in position. Tim Barker. Bolt on the New Actuator Fit the new actuator/coupler on top of the trailer tongue, making sure ...