Roof Racks are specifically engineered to meet the challenges and abuse that traveling off road demands. Wilderness roof racks can mount to existing rain gutters on vehicle. No drilling is required for installation. Roof racks can also mount directly into an existing factory roof rack. The track system mounting kit is specialty designed for vehicles without a factory OEM luggage rack installed. This system will mount to fiberglass or metal tops and drilling is required for this type of rack.