Universal Roof Rack Crossbar: Our roof rack cross bars are designed to fit on a naked roof【Compatible Vehicle】This truck topper ladder rack is designed to be versatile and can be installed on various vehicles such as truck caps, pickup toppers, van roof racks, truck beds, camper shells, and trailer toppers. It requires drilling for installation. The dual channels on the truck camper roof rack crossbars use T-nuts for easy attachment of accessories and loads.【Solid addition】The ladder rack also features eye hook locations, allowing users to securely tie down tools or loads for added safety.