1968 GMC Trucks Conventional Models Gas and Diesel Medium Tonnage Sales Brochure. GMC's 92-inchers mean business. Meet GMC's thrifty, hard-working medium-tonnage conventional models. Gasoline or diesel powered -- these rugged trucks have stamina for the long haul, plus the maneuverability needed in city traffic. All units feature a compact 92" cab that provides better front-axle weight distribution and permits the use of longer bodies and trailers. The 92" cab is a GMC exclusive in the medium-duty field. Check the wide choice of durable, high-quality truck components shown in this folder. You'll see why GMC's 92" medium-duty haulers--built, sold and serviced by truck people--mean business...for you. Specifications on back. Condition: Rust on staples.