Atwood's 3,500 Heavy Duty Power Jack. Atwood Power Jacks make hooking up a trailer hassle-free. The patented design and convenience of push button operation take the physical exertion out of cranking a trailer up or down. Simply push the button to quickly and effortlessly raise or lower the trailer into position with complete control. The Heavy-Duty Power Jack is designed for use with equalizer bars. It features Atwood Ball Screw Technology and can lift 3,500 lbs. Atwood jacks are carefully designed to provide years of trouble-free use. They require little maintenance and use a rugged 12VDC electric gear motor that has been proven in years of use under adverse conditions.