"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. 41-47, Includes 1 Hydraulic beam stabilizing jack, Lift Capacity To Full Height lbs. 40,000, Static Load Capacity lbs. 100,000, Wheel Type 10-in. hard rubber, Material Type High strength steel. Flush-type grease zerk fitting for lubricating Features ACME screw Meets OSHA regulations when used with wheel chocks Includes reflective collar for improved night visibility Rugged steel construction with safety yellow powder-coat finish 10in. x 2in. hard rubber wheels"
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