CURT Replacement Ram 2500, 3500 Puck System 5th Wheel Adapter with Standard Rails, 25,000 lbs Model 16042 64" deep shelf inside the box 6 Way Round Connectors deep shelf inside the box gives you more options for sorting and storing your equipment this core greatly increases the structural integri ty of the lid to prevent bending and warping an d to ensure smooth opening and closing The adapter provides a set of industry standard 5th wheel rails to securely mount a CURT 5th wheel hitch or roller into the bed of your truck and is compatible with all CURT 5th wheel legs and rollers (weight capacities are limited to the lowest rated towing component)