2016 Peterbilt 579 Towing Capacity & Payload

The 2016 Peterbilt 579 is a heavy-duty semi-truck, and its "towing capacity" is typically measured by its Gross Combination Weight Rating (GCWR) rather than a conventional trailer weight rating like those found on light-duty trucks.

Quick answer

• Max GCWR: Varies significantly by configuration, but commonly ranges from 80,000 lbs to 140,000 lbs or more, depending on the engine, transmission, axle ratios, and specific vocational upfitting. It's crucial to consult the door jamb sticker and Peterbilt documentation for the exact rating of your specific truck.
• Max Payload: Not typically expressed as a single "payload" figure like light-duty trucks. Instead, consider the Gross Vehicle Weight Rating (GVWR) minus the truck's curb weight. GVWRs for the 2016 Peterbilt 579 can range from around 33,000 lbs to 60,000 lbs or higher for specialized applications.
• GVWR: 33,000–60,000+ lbs (dependent on axle configuration and vocational setup)
• GCWR: 80,000–140,000+ lbs (dependent on engine, transmission, and axle ratios)
• Curb Weight: Varies significantly based on spec, engine, transmission, sleeper configuration, and fuel. A typical tractor might range from 16,000 to 22,000 lbs, but can be much higher with specialized equipment.
• Hitch Class: Not applicable in the conventional sense. The Peterbilt 579 is designed for fifth-wheel kingpin connections for semi-trailers.

Tow ratings by engine & trim

For heavy-duty trucks like the Peterbilt 579, "tow rating" is complex and defined by the Gross Combination Weight Rating (GCWR), which is the maximum allowable weight of the fully loaded truck and any attached trailer(s). The specific GCWR is highly dependent on the powertrain and chassis configuration.

Note: These figures are approximate and for reference only. Always refer to the specific truck's door jamb sticker (GAWR, GVWR, GCWR) and Peterbilt documentation for precise ratings, as configurations vary wildly based on original build and subsequent modifications.

Tow package contents

The concept of a "tow package" as seen in light-duty trucks does not apply to a heavy-duty tractor like the Peterbilt 579. These trucks are purpose-built for towing heavy semi-trailers.

Standard equipment relevant to its towing capability includes:

• Heavy-Duty Frame: Robust chassis designed for extreme loads.
• Powerful Diesel Engines: PACCAR MX-13 and Cummins ISX15 engines are standard, providing massive torque for pulling.
• Heavy-Duty Transmissions: Eaton Fuller manual or automated manual transmissions (AMT) are common, designed to handle high GCWRs.
• Robust Axles: High-capacity drive axles and suspensions are standard.
• Air Brake System: Comprehensive air brake system with trailer air connections.
• Fifth-Wheel Coupling: Standard equipment for connecting to semi-trailers.
• Integrated Communications/Electrical: Wiring for trailer lights, ABS, and auxiliary power is integrated.

Trailer sway control is inherent in the design and coupling of a semi-trailer and tractor; it