The Prinsu Universal Top Rack is a modular, adjustable, and completely bolt together roof rack for fiberglass toppers such as Leer, A.R.E, and Snugtop that are equipped with Thule/Yakima tracks. These racks work great on overland trailers and other applications as well. Models are available for many bed lengths so please choose the model that fits your bed length the best. The Prinsu Universal Top Rack is a great way to add additional capacity and functionality to your vehicle in an easy way. Each rack has 3-4 mounting feet that will allow you to bolt the rack to the Thule/Yakima tracks using the appropriate hardware. This design allows the addition of this roof rack without drilling or modification to your vehicle. The rack is completely modular in that you choose how your rack is configured. You can also choose the number of crossbars you assemble your rack with. The short bed rack comes standard with 6 cross bars for cargo. The long bed rack comes standard with 7 cross bars. Weight capacity of the racks varies based on the number of crossbars used and their configuration. We expect all consumers to use good judgment and common sense with the loads they plan to carry using these rack systems. The Top Rack is limited by the weight capacity of the topper. Please consult the manufacturer of your topper for guidelines and capacities regarding the load capacity of your individual topper.