1973 GMC Trucks Series 5000 6000 6500 Conventional Model Sales Brochure. The new medium-duty haulers...to keep things going for you. Improved Driver Comfort and Convenience. Design and Construction Keyed to Comfort, Durability, and Ease of Service. Operating Components That Contribute to Lower Operating Costs. Power...Gas or Diesel. Chassis that hold down operating costs. Specifications & Dimensions on back. Condition: Very good. ADV 73-8 (8-72)