GMC Sierra 3500 HD towing capacity
The 2026 GMC Sierra 3500 HD is rated to tow up to 36,000 lbs when properly equipped; the lowest-rated configuration tows 14,500 lbs. Pick a year for every engine and configuration.
By model year
| Year | Max trailer | Engines |
|---|---|---|
| 2026 | 36,000 lbs | 6.6L V8 Gas, Duramax 6.6L Turbo-Diesel V8 |
Where these numbers come from
Each year's figures are taken from GMC's own document for that year (2026 GMC Sierra 3500 HD Trailering Charts) and checked line by line against the original. The year pages link to the exact page. How we check.