The 2026 GMC Sierra 2500 HD towing capacity is up to 20,000 pounds conventionally, or 22,390 pounds when using a gooseneck or fifth-wheel trailer.1 While the latter does require extra gear, it does let your Sierra 2500 HD handle dozens of different camper types, RVs, dumpster trailers, and flatbed haulers that smaller full-size trucks can't necessarily tackle. But how does this heavy-duty truck handle it? And what configurations do you need to consider for the best towing experience?
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Since every trim level can equip the 6.6-liter Duramax turbo-diesel V-8 engine and come with a Crew Cab Standard Bed or Crew Cab Long Bed, all trims of the new GMC Sierra 2500 HD for sale (except for the AT4X) can tow 20,000 pounds conventionally. The Pro and SLE trims are the only two that can gooseneck tow 22,390 pounds,1 making them the prime picks for those wanting to handle the most weight. The AT4X is a hardcore off-roader, and thus can only tow 18,500 pounds conventionally.1
Without the 6.6-liter turbo-diesel engine, the GMC Sierra 2500 HD can comfortably tow 16,000 pounds, or 18,700 pounds with a gooseneck hitch.1
A towing capacity chart for the GMC Sierra 2500 HD requires some mention of Gross Combined Weight Rating, or GCWR, which is an approximation of the total weight of the truck plus trailer equipment.
Before 1991, the GMC Sierra 2500 HD (typically called the "C20" or "K20") was usually measured by GCWR instead of trailer weight rating. You can use your truck's GCWR, curb weight, and payload capacity to estimate your trailering capability.
| Year | Generation | Best Engine | Conventional Towing Capacity/GCWR |
|---|---|---|---|
| 1987 | 1 (Chevrolet C/K) | 5.7L V-8 | 13,500 lb GCWR3 |
| 1988 | 1 (Chevrolet C/K) | 5.7L V-8 | 13,500 lb GCWR3 |
| 1989 | 1 (Chevrolet C/K) | 5.7L V-8 | 13,500 lb GCWR3 |
| 1990 | 1 (Chevrolet C/K) | 5.7L V-8 | 13,500 lb GCWR3 |
| 1991 | 1 (Chevrolet C/K) | 5.7L V-8 | 10,000 lbs1 |
| 1992 | 1 (Chevrolet C/K) | 5.7L V-8 | 10,000 lbs1 |
| 1993 | 1 (Chevrolet C/K) | 5.7L V-8 | 10,000 lbs1 |
| 1994 | 1 (Chevrolet C/K) | 5.7L V-8 | 10,000 lbs1 |
| 1995 | 1 (Chevrolet C/K) | 5.7L V-8 | 10,000 lbs1 |
| 1996 | 1 | 6.5L Diesel | 8,500 lbs1 |
| 1997 | 1 | 7.4L V-8 | 11,000 lbs1 |
| 1998 | 1 | 7.4L V-8 | 11,000 lbs1 |
| 1999 | 1 | 7.4L V-8 | 11,000 lbs1 |
| 2000 | 1 | 6.5L Diesel (HD) | 11,000 lbs1 |
| 2001 | 2 | 8.1L V-8 or 6.6L V-8 Diesel | 15,900 lbs1 |
| 2002 | 2 | 8.1L V-8 or 6.6L V-8 Diesel | 12,000 lbs1 |
| 2003 | 2 | 8.1L V-8 or 6.6L V-8 Diesel | 16,100 lbs1 |
| 2004 | 2 | 8.1L V-8 or 6.6L V-8 Diesel | 12,000 lbs1 |
| 2005 | 2 | 8.1L V-8 or 6.6L V-8 Diesel | 12,000 lbs1 |
| 2006 | 2 | 8.1L V-8 or 6.6L V-8 Diesel | 12,000 lbs1 |
| 2007 | 3 | 6.0L V-8 | 12,900 lbs1 |
| 2008 | 3 | 6.0L V-8 | 12,900 lbs1 |
| 2009 | 3 | 6.0L V-8 | 13,000 lbs1 |
| 2010 | 3 | 6.0L V-8 | 13,000 lbs1 |
| 2011 | 3 | 6.0L V-8 | 13,000 lbs1 |
| 2012 | 3 | 6.0L V-8 | 13,000 lbs1 |
| 2013 | 3 | 6.0L V-8 | 13,000 lbs1 |
| 2014 | 3 | 6.0L V-8 | 13,000 lbs1 |
| 2015 | 4 | 6.0L V-8 | 13,000 lbs1 |
| 2016 | 4 | 6.0L V-8 | 14,500 lbs1 |
| 2017 | 4 | 6.0L V-8 | 14,500 lbs1 |
| 2018 | 4 | 6.0L V-8 | 14,500 lbs1 |
| 2019 | 4 | 6.0L V-8 or 6.6L V-8 Turbo Diesel | 14,500 lbs1 |
| 2020 | 5 | 6.6L V-8 Turbo Diesel | 18,500 lbs1 |
| 2021 | 5 | 6.6L V-8 Turbo Diesel | 18,500 lbs1 |
| 2022 | 5 | 6.6L V-8 Turbo Diesel | 18,500 lbs1 |
| 2023 | 5 | 6.6L V-8 Turbo Diesel | 18,500 lbs1 |
| 2024 | 5 | 6.6L V-8 Turbo Diesel | 20,000 lbs1 |
| 2025 | 5 | 6.6L V-8 Turbo Diesel | 20,000 lbs1 |
| 2026 | 5 | 6.6L V-8 Turbo Diesel | 20,000 lbs1 |
While tow capacity is important for vacations, payload limits are too. The GMC Sierra 2500 HD has a payload capacity of 4,049 pounds with the Regular Cab.4 As you add features and add-ons, you reduce this amount: the Denali Ultimate, for example, has a towing capacity of 3,153 pounds.4
Ready to explore our new GMC inventory and take home a model you can trust? The GMC Sierra 2500 HD is the perfect middle ground between the full-size 1500 and the titanic 3500. Whether you're bringing a camper to your local campsite or hauling an RV across the country, the 2500 is a fantastic choice for your next workhorse.
If you want maximum towing capacity in 2026, you'll need the available 6.6-liter turbo diesel V-8. This unlocks the GMC Sierra 2500 HD maximum conventional towing capacity of 20,000 pounds or gooseneck capacity of 22,390 pounds.1 The gas engine is plenty capable, but can't tow as much as the diesel.
The GMC ProGrade Trailering system involves two unique trailer assistance tools:
Yes, most Sierra 2500 HD models have an integrated brake controller. This simplifies hauling larger trailers, shortens your setup time, and helps keep you safe on the road while pulling campers or boats.
Yes, with a conventional towing capacity of 20,000 pounds (and even more fifth-wheel capacity),1 the GMC Sierra 2500 HD can handle midsize RVs, large boats, and horse trailers with multiple animals. Especially with Class A motorhomes or fifth-wheel horse carriers, it's important to weigh the trailer after loading items.
There are several add-on GMC Sierra 2500 HD packages for towing and hitching, including:
Towing any amount of weight will negatively impact fuel economy for the Sierra 2500 HD. The engine naturally has to work a bit harder to handle the truck and your trailer. However, the Sierra 2500 HD has the heavy-duty suspension, sturdy frame, and powertrain options to haul massive weight without losing too much fuel economy.
Yes: in fact, the GMC Sierra 2500 HD can only achieve its maximum towing capacity of 22,390 pounds1 when properly equipped for gooseneck towing. To do so, make sure you purchase the correct add-ons for a gooseneck hitch, inflate your tires to recommended PSI, and weigh the trailer's tongue weight carefully before hitching up.
1GM-estimated. Maximum trailering ratings are intended for comparison purposes only. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner's Manual. The trailering capacity of your specific vehicle may vary. The weight of passengers, cargo and options or accessories may reduce the amount you can trailer.
2Class is gasoline and diesel heavy duty pickups in the GM Large Pickup segment. Based on latest competitive data available. Excludes other GM vehicles.
3GCWR ratings assume vehicles are properly equipped with manufacturer-recommended towing setups. Actual weight capacities may vary.
4These maximum payload ratings are intended for comparison purposes only. Before you buy a vehicle or use it to haul people or cargo, carefully review the vehicle loading section of the Owner's Manual and check the carrying capacity of your specific vehicle on the label on the inside of the driver's door jamb.