Bed covers protect your truck bed while still allowing for you to still see your 3rd brake light. Truck bed covers or tonneau covers also keep your cargo away from the elements and possible thieves. They can also be a quick way to alter your truck's look while providing you with a versatile way to use your truck bed. Some users may even see an increase in fuel efficiency. Truck bed covers are one of the most popular truck accessories on the market today. Most bed covers are impact resistant, scuff resistant, have tight rail seals, and can work with bed rails.