TRADITIONAL - Model 388 Versatility and Productivity, On- or Off-Road A lightweight all-aluminum cab features aircraft grade fasteners, lap seam construction and bulkhead style doors for toughness and corrosion resistance. It provides years of virtually water-tight, rattle-free performance. The Model 388’s slightly sloped aluminum hood increases visibility and features removable aluminum fenders and a proprietary, anti-blow-down locking mechanism to prevent unintentional closure. New halogen projector, aluminum headlamps and long-life, LED directional signals are protected with an impact-resistant lens. Forward lighting is increased by 226% and bulb life is extended by nearly 600%. Peterbilt’s Unibilt cab sleeper system combines the cab and sleeper into a single structural unit with an independent dual air bag and shock absorber suspension system for an exceptionally smooth ride.