---
id: what-heavy-duty-trucks-does-markquart-motors-offer
title: "What heavy-duty trucks does Markquart Motors offer?"
category: faq
subtopic: gmc-sierra-hd-heavy-duty
page_type: faq
source_url: "https://www.markquartmotors.com/new-vehicles/gmc/trucks.htm"
tags: ["GMC Sierra HD", "heavy duty", "6.6L diesel", "towing"]
questions:
  - "What is the GMC Sierra Heavy Duty?"
  - "How much can the Sierra HD tow?"
  - "What diesel engine is in the Sierra Heavy Duty?"
related: [gmc-trucks-overview, gmc-sierra-1500-towing]
dealer: Markquart Motors
---

The 2026 GMC Sierra Heavy Duty is built for the toughest jobs. It features an available Duramax 6.6L Turbo-Diesel V8 delivering 470 horsepower and a massive 975 lb-ft of torque, with max towing up to 36,000 pounds-extreme power for commercial and heavy work.

Sierra HD includes two-speed transfer cases, skid plates, and trail hardware on Z71, AT4, and AT4X variants. Camera technology spans up to 14 views including advanced trailering assists, while the upscale cabin offers authentic wood and aluminum accents on Denali models, plus heated and ventilated seating.

If you're managing a fleet or need serious towing and payload capacity, Markquart Motors has the expertise to help. Call (715) 833-0444 to discuss your commercial or work-vehicle needs, or explore current inventory online.