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Trailer Winch - Sliding Double L Style - Available in Many Styles
US Cargo Control Standard Profile Sliding Winch for Double L Track, Durable Steel Winch, Holds Up to 20 Feet of Webbing, Slides to Any Position for Winch Control, Black, 4 Inch :
DC Cargo Sliding Winch for Flatbed Trailer | Heavy Duty Standard Tie-Down Winch : Amazon.com.au: Home Improvement