CURT OEM puck system 5th wheel rails for Chevrolet and GMC trucks combine the functionality of CURT 5th wheel puck system products with the strength and convenience of the factory truck bed puck system. The rails are industry-standard to securely mount a CURT 5th wheel hitch or any other 5th wheel with industry-standard mounts. They are designed to fit select model years of the Chevrolet Silverado 2500 HD and 3500 HD and GMC Sierra 2500 HD and 3500 HD (see application info to verify fitment). The rails feature a set of adjustable, quarter-turn anchors to quickly and easily drop into the pucks and provide a moveable platform for the 5th wheel coupling point. This puck system adapter requires a specific puck system for installation (year range specific). It features a capacity of 30,000 lbs. GTW and a vertical load limit of 7,500 lbs. (weight capacities are limited to the lowest-rated towing component). Like our other OEM puck system 5th wheel products, the key feature of these puck system 5th wheel rails are their quarter-turn anchors. The rails can easily be dropped into place whenever needed and secured with the quarter-turn anchors. The anchors can also be adjusted to help eliminate chucking noises between the rails and under-bed platform while towing. When you are finished towing, simply turn the anchors to remove the entire assembly within seconds. CURT 5th wheel rails for Chevrolet and GMC pickup trucks provide the ultimate in versatility for the CURT 5th wheel line. They are tested for safety in accordance with SAE J2638 and are coated in a highly durable carbide black powder coat finish to protect against scratches and rust.