New & Used 2026 GMC Sierra 3500HD for Sale near Williamstown, ON

Summary

• With 70 currently listed for sale and an average price of $116,170 CAD, 48.6% of 2026 GMC Sierra 3500HDs for sale on CarGurus are rated as good or great deals.

• 100.0% of 2026 Sierra 3500HD models on CarGurus are accident free.

Why it stands out

The 2026 GMC Sierra 3500HD stands out as a heavy-duty truck that blends serious work capability with a broader spread of trims and features than its utilitarian roots might suggest. It is offered in six trim levels, from the base Pro to SLE, SLT, AT4, Denali, and Denali Ultimate, and buyers can choose among regular cab, extended cab, and crew cab body styles, along with short-bed or long-bed configurations and single- or dual-wheel rear axles. That flexibility is a major part of its appeal, because it lets the truck be configured as a straightforward workhorse or as a more upscale, better-equipped hauler.

Capability remains the Sierra 3500HD’s defining strength. With the diesel engine, a single cab body, rear-wheel drive, a gooseneck hitch, and dual rear wheels, it can haul up to 3,375 kilograms and tow up to 16,100 kilograms. The engine lineup includes a 6.6-litre V8 with 401 horsepower and 464 pound-feet of torque, plus a 6.6-litre Duramax turbodiesel V8 with 445 hp and 910 lb-ft of torque. The truck also offers towing-focused technology such as trailer hitch guidance, jack-knife alert, adaptive cruise control with trailering assist, a weight limit monitor, and a transparent trailer camera view, which helps explain why it is aimed at buyers who need more than just brute strength.

Higher trims give the Sierra 3500HD a more premium feel, especially the AT4 and Denali models. The AT4 adds off-road hardware such as a specific suspension, all-terrain tyres, skid plates, a locking rear differential, and unique off-road drive modes, while the Denali brings luxury touches like premium leather, a wireless phone charger, a larger touchscreen, and parking proximity sensors. At the same time, the truck’s size can make it unwieldy in parking lots, and top trims can be prohibitively expensive.

Other model years to consider

• 2024 GMC Sierra 3500HD

  • Average price: $81,680 CAD
  • Good/great deal percentage: 31.7%
  • User rating: 5 / 5
  • Total listings: 205

• 2025 GMC Sierra 3500HD

  • Average price: $94,220 CAD
  • Good/great deal percentage: 40.2%
  • User rating: 5 / 5
  • Total listings: 174

• 2023 GMC Sierra 3500HD

  • Average price: $73,795 CAD
  • Good/great deal percentage: 28.6%
  • Total listings: 175

This analysis is based on CarGurus' proprietary market data from September 7, 2026, CarGurus experts' opinions, and generative AI.