STR-4100 Dok-Lok stabilizes trailer in both vertical and horizontal directions to ensure smooth transition between dock and trailer. It helps prevent chronic personnel injuries at loading dock from trailer drop, and can stabilize trailer with loads up to 35,000 lb. Rotating hook design engages trailer’s Rear Impact Guard in 2-point entrapment to prevent all forms of trailer separation which can lead to catastrophic accidents. Restraint is automatically positioned as truck approaches dock.