Key Benefits: - Work station for bottom repair and cleaning - Trailer rolls in or out past jacks, allowing you to take boats on or off trailers easily - Jacks have a safety lock allowing boats to be left on jacks indefinitely - Jacks can be used on dirt, gravel, black top or cement - Jacks can be used anywhere: shop, yard, showroom - Lifts boats up to 40,000 lbs. (with 4 jacks) - 10 minute boat placement - 20" vertical lift - Lifts big boats right off the transport truck - Allows fast and easy trailer to trailer exchange - Expedite boat show setup. No waiting for a crane