The CORE FJC drop in expedition roof rack is now, This rack mounts to the existing roof rack and sits suspended above the roof. The rack is made of very strong extruded aluminum, this rack allows you to mount many different aftermarket roof rack accessories like Rhino Racks products also Rotopax & MaxTrax mounts and many others. Each crosser is able to support 200lbs static load with out touching roof. Crossers can be placed every 6". place your order now.