Profile: 20th Century Fiberglass, Inc. supplies a range of truck caps and shopping tools. We offer fiberglass caps, aluminum caps and tonneau covers. We provide royal, ultra, high C and T-class fiberglass truck caps. Our royal series fiberglass truck caps are available for GMC/chevy, ford, dodge and toyota trucks. Our aluminum truck caps come in a variety of styles and window/door configurations. Our evolution tonneau cover product line features stylish lines that some prefer to the smooth, cargo tonneau cover, self-sealing frame, low skirt profile and easy-lift.