Question 1

What are the towing and payload capacities of the 2022 GMC Sierra 3500HD?

Accepted Answer

The 2022 GMC Sierra 3500HD is the most capable truck in GMC's lineup. Equipped with the Duramax 6.6-litre V8 diesel (445 hp, 910 lb-ft), configured as a single rear wheel (SRW) regular cab long box in rear-wheel drive with the maximum trailering package, it can tow up to 36,000 lb (16,329 kg) with a gooseneck hitch — among the highest towing ratings in the segment in Canada for 2022. Maximum payload reaches up to 7,442 lb (3,376 kg) on dual rear wheel (DRW) configurations, enabling the transport of extremely heavy loads on the truck bed itself. The gasoline 6.6L V8 (401 hp, 464 lb-ft) is rated up to approximately 23,100 lb conventionally. These capacities make the Sierra 3500HD suitable for pulling large fifth-wheel RVs (up to 38 feet in appropriate configurations), multi-horse trailers, heavy equipment transport trailers, and construction site deliveries that exceed the 2500HD's capability range.

Question 2

How reliable is the Duramax 6.6L diesel in the 2022 Sierra 3500HD in Canadian conditions?

Accepted Answer

The Duramax 6.6L L5P diesel in the 2022 Sierra 3500HD has established a strong reliability reputation in North America since its 2017 redesign. It has received refinements each model year, including improvements to emissions management and compatibility with B20 biodiesel blends available at select Canadian fuel stations. In Canadian winter conditions, diesel requires seasonally-appropriate winter-grade fuel, available coast to coast at major Canadian fuel retailers (Petro-Canada, Esso, Shell) throughout the cold season. For overnight temperatures below -20 degrees C — common across much of Canada from December through February — a block heater is strongly recommended to ease cold starts and protect the engine during warm-up. Duramax diesel engines are widely known for exceptional longevity: well-maintained examples regularly reach 400,000 to 600,000 km or more in fleet and commercial service, making the 3500HD a strong long-term asset for Canadian contractors and fleet operators.

Question 3

What cab and box configurations are available on the 2022 GMC Sierra 3500HD in Canada?

Accepted Answer

The 2022 Sierra 3500HD was available in Canada in three cab configurations: regular cab (two doors, single row of seating), double cab (four doors, rear bench seat), and crew cab (four doors, full-size rear bench). Box options include standard box and long box, depending on cab choice. The most popular work-oriented combination is the crew cab with standard box, balancing passenger capacity with a manageable overall length for urban and job site maneuverability. The regular cab with long box maximises payload and cargo space and is preferred for agricultural and pure commercial work. A chassis cab version — with cab but no factory box — was also available for specialty upfitting such as flatdeck platforms, dump beds, service crane bodies, or utility boxes commonly used by Canadian municipalities, utilities, and construction fleets. Dual rear wheels (DRW, known as dually) provided maximum payload stability for heavy fifth-wheel applications and equipment hauling.

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