Standard Aluminum Truck Caps: Our classic aluminum truck caps offer a variety of styles to fit your individual needs. From our economy line for affordable bed protection, to our side door units for the working man's truck; all are sure to please. Century makes the best aluminum caps in the industry using .080 mounting rails (the heaviest available) combined with completely welded framework, tube and flange construction, and additional strap bracing in the rear corners.They are available from cab high up to 30" tall if you're looking for extra cargo space. Built for nearly every truck made, old or new, Century's standard aluminum caps have you covered.