Unless you opt for a Temporary pad system, you will definitely need additional rails on your car if you want to carry a kayak. Naturally, they have to be the kind that fits your vehicle's specific make and model, but most will be pretty basic to install. The main parts are the mount, the crossbars, and the tower/foot set. The mount is what is attached to the vehicle, and the way to attach them will depend on the mount type. The crossbars are what runs across the width of the roof. The tower/foot set is installed at the strongest points of the roof and they connect both the mount and the crossbars.