OSHA recommends trailer stabilizers for unsupported trailers. Placed under the front frame of your semi trailers, the APS Hold-Safe™ Stabilizer helps reduce accidents from trailer-tip and landing gear collapse durin......OSHA recommends trailer stabilizers for unsupported trailers. Placed under the front frame of your semi trailers, the APS Hold-Safe™ Stabilizer helps reduce accidents from trailer-tip and landing gear collapse during loading and unloading, when a tractor does not support the trailer. It also reduces the chance of landing gear sinking into asphalt or gravel drive aprons. Design HighlightsStatic capacity: 100,000 lbs. Lifting capacity: 50,000 lbs. Retracted length: 41 ¾", Extended length: 55 ¼" Travel: 13 ½" Weight: 185 lbs. Faster, easier with "Speed Crank" High Gear - 3.2 turns/inch Low Gear - 19.2 turns/inch Wheel style: 12" semi-pneumatic Color: Safety yellow