What exactly is a tonneau? Well a tonneau also known as a truck bed cover is exactly that, a cover that goes over a truck bed. There are many different types of tonneau covers on the market today. Some are made of vinyl that look like leather but hold up fairly well under different weather conditions as well as the ultra violet rays of the sun. Some tonneau covers are made of plastic, fiberglass and aluminum. Many of the soft vinyl covers have aluminum frames and aluminum bows which give the covers a slight arch for strength against snow load and also allow water to run off.
Some tonneau covers close up along the edges with snaps and others close up with rugged velcro tape. There are truck bed covers that open on hinges. Just lift up from the back of the pickup truck much like a trunk cover. These are known as a hinged tonneau. Several manufacturers make such a soft cover such as Extang with there fulltilt tonneau and Lund Genesis with there hinged tonneau. Tonneau Masters make a hinged tonneau they call the hinged slantside. Gaylords make a couple model hinged tonneau covers made of fiberglass, called the traditional and the x2000. Both of these models are available...