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Those are an ingenious design and they do make a difference over standard shackles. But the complexity outweighed the benefits, so they were eventually discontinued.
They came Standard on F-250, and were optional on F-100
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
