A sliding truck rack easily moves into any position to accommodate different size loads up to 600lbs and works with select tonneau covers. *TracRac Base Rails NOT Included* Features Sliding racks adjust to the length of the bed to carry different loads and can easily be removed Ideal rack height (18”) allows for easy truck bed access and sits below cab of truck for improved aerodynamics Easily mount the Thule Xsporter Pro Shift/Mid Accessory Side Bar for additional gear hauling capacity (sold separately) WindDiffuser technology disturbs airflow to reduce noise and drag for improved fuel economy Secure different size loads with adjustable aluminum load stops Thule TracRac Base Rails (sold separately) provide drill free installation and attach to the truck stake pockets No cutting or drilling and only limited assembly Accommodates a variety of Thule accessories Theft resistant system locks rack to base rail (locking knobs included) Durable, corrosion resistant aluminum construction Specs: Carrying capacity: 600 lbs Load bar dimensions: 71" long x 3-1/2" wide x 1-1/2" tall Maximum height from top of bed rail: Top of crossbar: 18" Top of load stop: 22-3/4" Limited lifetime warranty Check out if your truck bed works, using Thule's Fit Guide here.