The factors to consider when choosing a roof rack include: The size of your vehicle: Roof racks come in a variety of sizes, so you need to make sure that the rack you choose is the right size for your vehicle. The type of cargo you will be carrying: If you plan on carrying large or heavy items, you will need a roof rack that can support the weight. The features you need: Some roof racks come with additional features, such as locks, tie-downs, and roof baskets. Your budget: Roof racks can range in price from a few hundred dollars to a few thousand dollars.