Tonneau covers offer protection from the harsh weather for both the truck bed and its contents. Keeping the rain, snow, and blistering sun off your bed will help to prolong the life of your truck...not to mention the load of lumber you're hauling to the job site.
Tonneau covers also help to improve the fuel economy of your truck by reducing the amount of drag caused by the tailgate. By keeping air flowing above the bed, you are reducing wind resistance, and a more aerodynamic truck is going to get better gas mileage. Although there are many factors which affect the fuel efficiency of your vehicle, adding a truck bed cover can have a dramatic effect, with some estimates showing that your miles per gallon may increase 5-10%. With savings like this, a truck bed cover will pay for itself over time.
Many states legally require that the contents of your pickup bed must be secured. A tonneau cover is a great way to accomplish this...and after all, if you took the time to put something in your truck bed, you probably want it to stay in there.
Truck bed covers come in a wide variety of styles and are custom fit for your truck.