【HEAVY-DUTY MATERIAL】Electric trailer jack is constructed with aluminum alloy material, durable and sturdy.This trailer mover has a pulling capacity of up to 5000 lbs (2270 kg) and a jockey wheel load of 600 lbs (272 kg), which allows you to steer the trailer effortlessly. 【BROADENED WHEELS FOR OUTDOOR】To allow for optimal torque, the heavy-duty wheel has a gear ratio of 326:1. With the width of 2.8" (70 mm) and diameter of 8" (190 mm), it ensures excellent traction on any surface, featuring an automatic brake function for reliable safety. 【EASY INSTALLATION】Trailer jockey wheel is equipped with a mounting bracket for convenient attachment to your trailer. It is widely used to move your caravan, boat trailer, or horse trailer, suitable for confined spaces. Note: The product cannot be used on a ramp greater than 5°. 【CONVENIENT OPERATION】Equipped with two control handles. The height of the jockey wheel can be easily controlled by turning the lift handle. With forward and reverse and automatic braking functions. Before use check whether the handle positioning key is fully tightened !!! 【SMART CONTROL COMPONENTS】Electric components inside the control box helps protect the motor from overheat damage. The powerful 12V DC 350W motor provides power to the gear mechanism, and the reduction gears convert motor power into moving force.