Get your semi truck Ready for the Road Ahead™ with improved suspension performance, with the Hendrickson AMBOX™ Trailer Replacement Slider Assembly. With an adjustable design, this replacement slider is move as needed to optimize the positioning of a trailer's axles. Crafted with a patented K-2 slider box technology to create the ultimate combination of strength and durability. FleetPride is your First Click in Heavy Duty®.