If you want to use a roof top tent successfully, you must have a third-party roof-rack system. Which is installed on your car. Why can’t you use the factory-installed roof rack? On the lighter end, roof tents weigh around 150 pounds and most preinstalled roof bars are graded to hold exactly 150 pounds, not more. If you place a roof top tent on a factory-installed roof rack, there’s a good chance you’ll not only break the rack but also damage your car.
Even if you have a good third-party rack installed on your car, the weight of the tent can affect your car in a host of other ways, such as, the most obvious is substantially reduced mileage .