2020 GMC Sierra 2500HD Towing Capacity & Payload

The 2020 GMC Sierra 2500HD can tow a maximum of 18,500 pounds.

Quick answer

• Max Towing Capacity: 18,500 lbs (conventional) / 18,500 lbs (5th-wheel/gooseneck)
• Max Payload: 3,979 lbs
• GVWR: 10,650 lbs - 11,350 lbs
• GCWR: 27,500 lbs
• Curb Weight: 6,700 lbs - 7,370 lbs (varies significantly by configuration)
• Hitch Class: Class IV or V (depending on configuration, up to 2.5-inch receiver)
• Max Tongue Weight (Conventional): 1,850 lbs (or 10% of maximum conventional tow rating)

Tow ratings by engine & trim

The 2020 GMC Sierra 2500HD is a heavy-duty truck designed for serious towing, offering impressive capabilities across its various configurations. The primary engines available are the 6.6L V8 gasoline engine and the 6.6L Duramax Turbo-Diesel V8.

Note: These figures represent the maximum towing and payload capacities. Actual capacities for your specific vehicle may vary based on factory options, trim level, and installed accessories. Always consult your vehicle's door-jamb sticker and owner's manual for precise figures.

Tow package contents

To maximize its towing potential, the 2020 GMC Sierra 2500HD often comes equipped with (or offers as an option) several essential features for safe and efficient trailering:

• Integrated Trailer Brake Controller: Allows for seamless control of electric trailer brakes, providing proportional braking force. This is crucial for safely slowing and stopping a heavy trailer.
• Automatic Locking Rear Differential: Enhances traction in low-traction situations, which can be beneficial when launching a boat or traversing uneven terrain with a trailer.
• Trailer Sway Control: Integrated into the StabiliTrak stability control system, this feature automatically detects and intervenes when trailer sway is detected, helping to keep the truck and trailer combination stable.
• Trailering Package: Often includes a 7-pin and 4-pin trailer connector, a 2.5-inch receiver hitch (with a 2-inch adapter), and an automatic locking rear differential.
• Heavy-Duty Transmission Cooler: Helps maintain optimal transmission fluid temperatures during demanding towing conditions, preventing overheating and premature wear.
• Trailer Camera System (Optional): Provides multiple camera views, including a transparent trailer view allowing the driver to "see through" the trailer, making maneuvering easier and safer.

5th-wheel & gooseneck

As a heavy-duty truck, the 2020 GMC Sierra 2500HD is fully capable of handling 5th-wheel and gooseneck trailers. The max 5th-wheel/gooseneck towing capacity mirrors the maximum conventional towing capacity at 18,500 pounds when properly equipped with the 6.6L Duramax Diesel engine.

For 5th-wheel and gooseneck setups, the truck will typically require an aftermarket hitch installation in the bed, though some models may offer a factory-installed prep package. Always ensure your hitch system is rated for the weight of your trailer and that it is professionally installed.

Weight distribution & WDH requirements

For conventional towing, especially with heavier trailers approaching the maximum conventional tow rating, a Weight Distribution Hitch (WDH) is highly recommended or even required. A WDH helps to distribute the tongue weight of the trailer more evenly across the axles of both the truck and the trailer, improving stability, handling, and braking performance.

While the 2020 GMC Sierra 2500HD has a robust suspension, a WDH helps mitigate squatting at the rear of the truck and light steering at the front. Consult your owner's manual for specific weight distribution hitch requirements and recommendations based on your trailer's loaded weight and tongue weight.

Real-world towing tips for this vehicle

1. Know Your Weights: Always weigh your truck and trailer, ideally fully loaded and ready for a trip. Compare these weights to the GVWR, GAWR (Gross Axle Weight Rating), and GCWR of your Sierra 2500HD.
2. Proper Trailer Loading: Distribute the trailer's cargo to achieve approximately 10-15% of the total trailer weight as tongue weight. Too little or too much tongue weight can cause unstable handling.
3. Check Tires: Ensure both your truck and trailer tires are properly inflated to the recommended pressures for towing, which are often higher than everyday driving pressures.
4. Practice: Get a feel for how your truck handles with the trailer attached before hitting the open road. Practice turning, braking, and backing up in a safe, open area.
5. Maintain Your Vehicle: Regular maintenance, especially brakes, tires, cooling system, and transmission fluid, is crucial for safe and reliable towing.
6. Slow Down: Towing significantly increases stopping distances and reduces maneuverability. Adjust your speed and leave ample following distance.

Common towing-related issues

Even with a capable truck like the Sierra 2500HD, towing can present challenges:

• Overheating: While the Duramax and gas engines are robust, continuous heavy towing in hot climates or up steep grades can stress the cooling system. Monitoring temperature gauges is vital.
• Brake Wear: The added weight of a trailer significantly increases brake wear. Ensure both truck and trailer brakes are in excellent condition.
• Tire Blowouts: Overloaded or underinflated tires are a common cause of blowouts, which can be dangerous while towing. Regularly inspect and maintain your tires.
• Trailer Sway: Improper loading, strong crosswinds, or sudden maneuvers can induce trailer sway. The integrated trailer sway control helps, but proper loading and safe driving practices are key.
• Suspension Sag: Heavy tongue weight without a WDH can cause the rear suspension to sag, affecting steering and headlight aim. Airbags or helper springs can also assist with leveling.

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