Knickerbocker Bedbridge™ Kit For Wood Side Rails By Knickerbocker. Transform your wooden bed by replacing the traditional wood slats with the rock solid support of the Bedbridge™ system. Includes a 3 suspension system made of heavy duty steel beams with three adjustable leg supports and mounting hardware. Knickerbocker Four-Ever Ultra Premium Frame High Profile or Low Profile By Knickerbocker. Heavy duty, 8" or 5" height metal frame. Adjusts to fit Twin through King sizes. Price includes shipping. Features Glide Legs instead of rollers.