2019 GMC Sierra 2500HD Towing Capacity & Payload

The 2019 GMC Sierra 2500HD can tow up to 18,100 pounds when properly equipped with the 6.6L Duramax diesel engine and a 5th-wheel or gooseneck hitch. Whether you are hauling heavy construction equipment or a massive luxury RV, the Sierra 2500HD is a capable workhorse built to handle serious loads. As the final model year of the K2XX generation, the 2019 Sierra 2500HD benefits from years of refinement, offering impressive SAE J2807-certified tow ratings and a robust factory trailering package.

Quick answer

Here are the maximum capabilities for the 2019 GMC Sierra 2500HD across its most capable configurations. Because these numbers vary wildly based on cab size and engine, always check your specific vehicle's door-jamb sticker.

• Max Tow Capacity: 14,500 lbs (Conventional) / 18,100 lbs (5th-Wheel/Gooseneck)
• Max Payload: Up to 3,276 lbs (6.0L V8, Regular Cab, 2WD)
• GVWR: 9,500 lbs to 10,000 lbs (Gross Vehicle Weight Rating)
• GCWR: Up to 25,300 lbs (Gross Combined Weight Rating with Duramax)
• Curb Weight: 5,741 lbs to 7,656 lbs (depending on cab, bed, and engine)
• Hitch Class: Class V (2.5-inch receiver with a 2-inch adapter sleeve), supporting up to 1,450 lbs conventional tongue weight.

Tow ratings by engine & trim

Below is a breakdown of the maximum capacities based on engine and drivetrain. Note that your exact trim level (e.g., SLE, SLT, Denali) and cab/bed configuration will lower these maximums as luxury features add curb weight. Always verify your truck's specific ratings on the Tire and Loading Information label.

Tow package contents

GMC equipped most 2019 Sierra 2500HD models with a heavy-duty Trailering Equipment Package to ensure the truck could safely and effectively handle its max ratings. When shopping for or setting up your truck, look for the following factory inclusions:

• Heavy-Duty Hitch Receiver: A 2.5-inch receiver with a 2-inch insert, complete with a 7-pin and 4-pin wiring harness connector.
• Integrated Trailer Brake Controller: Allows the driver to adjust the trailer brake gain directly from the dashboard for seamless braking integration.
• Cooling Upgrades: An external engine oil cooler and an auxiliary transmission fluid cooler to manage the massive heat generated while pulling heavy loads up steep grades.
• Trailer Sway Control: Integrated into the StabiliTrak electronic stability control system, this automatically applies the truck's brakes to keep the trailer tracking straight if it detects swaying.
• Exhaust Brake (Diesel only): The Duramax engine includes an exhaust brake system to help slow the truck on downhill grades, reducing wear and heat on the conventional brake pads.

5th-wheel & gooseneck

As a heavy-duty truck, the 2019 GMC Sierra 2500HD is primed for 5th-wheel and gooseneck towing. While conventional towing maxes out at 14,500 lbs (limited by the rear hitch receiver), utilizing a 5th-wheel or gooseneck setup in the truck bed centers the tongue weight directly over the rear axle. This allows the 6.6L Duramax diesel to pull up to 18,100 lbs in a Regular Cab, 2WD configuration. GMC offered a factory 5th-wheel/gooseneck prep package that included a spray-in bedliner and pre-drilled holes with a 7-pin wiring harness relocated to the inner bed wall.

Weight distribution & WDH requirements

If you are towing conventionally, General Motors requires the use of a Weight Distribution Hitch (WDH) when your trailer weight exceeds a certain threshold—typically 1,000 to 1,500 pounds of tongue weight or trailers heavier than 10,000 lbs. A WDH leverages spring bars to distribute the tongue weight evenly across the truck's front and rear axles, as well as the trailer axles. This prevents the rear end from sagging, which would otherwise compromise front-wheel traction, steering feel, and headlight alignment. Always adjust the WDH strictly according to the hitch manufacturer's guidelines while factoring in your loaded vehicle weight.

Real-world towing tips for this vehicle

• Monitor your payload: Heavy trailers can have tongue weights of 15% to 20% (for 5th-wheels). With Denali trims, payload capacity can be surprisingly low (around 2,400 lbs). Four adult passengers and a heavy pin weight can easily exceed your 10,000 lb GVWR.
• Use the exhaust brake: If you have the Duramax diesel, make a habit of turning on the exhaust brake when towing downhill. It will save your brakes and provide a much more stable descent.
• Check tire pressures: Always inflate your rear tires to the maximum cold pressure listed on the door sticker (usually 70-80 psi on the 2500HD) before hooking up a heavy trailer to reduce sidewall flex and heat buildup.

Common towing-related issues

While the 2019 Sierra 2500HD is incredibly durable, frequent heavy towing can accelerate wear. Common things to watch out for include:

• Transmission fluid degradation: Heavy loads generate extreme heat in the Allison 1000 transmission. Towing frequently requires much shorter transmission fluid service intervals.
• EGT sensor failures: On Duramax models, heavy towing combined with short trips can sometimes trigger Exhaust Gas Temperature sensor faults or DPF (Diesel Particulate Filter) regeneration issues.
• Suspension sag: Factory leaf springs on the 2500HD are tuned for a balance of ride comfort and load carrying. Heavy 5th-wheels can cause severe rear sag; many owners install aftermarket airbags to level the ride.

If your truck needs preventative maintenance before the next towing season, or if you suspect your suspension needs an upgrade, do not ignore it. Find a trusted shop on Repairius.