A roof rack is an aftermarket modification that increases a vehicle's height. Laws are in place to protect bridges and overpasses, permitting trucks, trailers, and cargo to reach up to 13 feet 6 inches in height, which limits the allowable height of vehicles on a car shipping trailer. Since every inch is crucial, it is advisable to remove the rack and store it inside the vehicle if feasible. Should the rack be irremovable, obtaining a custom quote for the shipment becomes necessary.