Leading truck cap and tonneau cover manufacturer A.R.E. has expanded its Deluxe Commercial Unit (DCU) truck cap offerings to include the 2008 Chevrolet Silverado and GMC Sierra. A.R.E.'s DCU is available in four height configurations - 23 inches, 26 inches, 29 inches and 36 inches - with several rear door options. In addition, truck owners can choose from optional roof racks, various toolbox configurations, a selection of window and door sizes and a polyester fabric liner designed to prevent condensation from collecting on the interior of the cap.