The Powerjack System of trailer jacks is a powerful quick and easy to use system that will allow you to detach from a heavy towed unit with in 2 to 3 minutes. This saves the operator time and effort while possibly reducing the risk of injury. The Powerjack 3500 for midsize trailers up to 3500Lbs hitch weight, 26" total lift The Powerjack 7500 for larger trailers up to 7500lb hitch weight, 26" total lift The Powerjack 7500ER for high clearance applications with 7500lb weight rating and 29" of total lift. Dual jacks for stability and double capacity, to 15,000 pounds hitch weight. Powered by a 10,000 psi hydraulic hand pump or air over hydraulic pumps Powerjacks will save you time and money by letting you park your loaded trailer easier and faster getting you back to work sooner