A packed roof rack raises the center of gravity of your car, leaving it susceptible to intensified swaying -- especially at high speeds. Load shift often happens if the roof rack is not packed properly, which can cause all sorts of problems while driving. If the weight is too far to the front, it'll dive forward every time you brake, and if it's too far to the back, it makes the steering feel loosey-goosey. So it's super important to pack a stable load and secure it tightly. The key is to spread out the load, so the weight and size of items are evenly distributed.