"Jack prevents up-ending semi-trailer when it is not connected to a tractor during loading and unloading operations. Also used to level trailer parked on sloped ground and to prevent landing gear from sinking into a soft surface. U.S.A. Application Prevents up-ending semi-trailer, Color Yellow, Height Range in. 41-50, Includes 1 Ratchet jack, Lift Capacity To Full Height lbs. 40,000, Wheel Type 10-in. hard rubber, Material Type High strength steel, Static Load Capacity lbs. 100,000. Flush-type grease zerk fitting for lubricating"
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