The 2026 GMC Sierra Heavy Duty lineup delivers the towing muscle, advanced technology, and premium comfort that Waxahachie drivers demand from a heavy-duty truck. Whether you need the Sierra 2500HD for everyday hauling or the 3500HD for maximum pulling power, Legacy GMC of Waxahachie has the right Sierra HD for your next job or adventure.
The 2026 Sierra 2500HD offers a maximum available towing capacity of up to 22,390 pounds when properly equipped with the available Duramax 6.6L Turbo-Diesel V8 engine — making it one of the most capable three-quarter-ton trucks on the market. For drivers in Midlothian, Ennis, and DeSoto who need even more hauling power, the Sierra 3500HD takes capability further with a maximum gooseneck/fifth-wheel towing capacity of up to 36,000 pounds in its dual-rear-wheel configuration. Both models offer conventional towing of up to 20,000 pounds with the diesel engine and Max Trailering Package.
| Specification | Sierra 2500HD | Sierra 3500HD |
|---|---|---|
| Max Conventional Towing | Up to 20,000 lbs | Up to 20,000 lbs |
| Max Gooseneck/5th-Wheel Towing | Up to 22,390 lbs | Up to 36,000 lbs |
| Max Payload | Up to 4,049 lbs | Up to 7,290 lbs |
| Dual-Rear-Wheel (Dually) Available | No | Yes |
| Starting MSRP* | $47,000 | $47,900 |
*MSRP excludes tax, title, license, dealer fees, and optional equipment. Dealer sets final price. Maximum trailering and payload ratings are intended for comparison purposes only and require a properly equipped vehicle. Actual capacity depends on cab configuration, bed length, drivetrain, and optional equipment. Before you buy a vehicle or use it for trailering, carefully review the trailering section of the Owner’s Manual.
Every Sierra HD starts with a capable 6.6L V8 gasoline engine paired with an Allison 10-speed automatic transmission. For maximum towing performance, the available 6.6L Duramax Turbo-Diesel V8 is the go-to choice for contractors, ranchers, and recreational towers across Corsicana and Arlington who regularly move heavy loads.
| Spec | 6.6L V8 Gas | 6.6L Duramax Turbo-Diesel V8 |
|---|---|---|
| Horsepower | 401 hp | 470 hp |
| Torque | 464 lb-ft | 975 lb-ft |
| Transmission | Allison 10-Speed Automatic | Allison 10-Speed Automatic |
| Max Conventional Towing | Up to 16,000 lbs | Up to 20,000 lbs |
The 2026 Sierra HD lineup offers seven trims to match any need and budget. The base Sierra 2500HD Pro starts at $47,000 MSRP* and comes equipped with standard trailering mirrors, an integrated trailer brake controller, wireless Apple CarPlay and Android Auto, and best-in-class HD cargo bed volume. Moving through the SLE ($54,000), SLT ($65,200), AT4 ($72,200), Denali ($75,200), AT4X ($85,200), and Denali Ultimate ($94,200), each trim adds capability and refinement — from the AT4’s off-road suspension with Rancho shocks and skid plates, to the AT4X’s Multimatic DSSV dampers and factory 1.5-inch suspension lift, to the Denali Ultimate’s full-grain leather Alpine Umber interior with 16-way massaging front seats and a 12-speaker Bose sound system.
*MSRP excludes tax, title, license, dealer fees, and optional equipment. Dealer sets final price.
Starting on the SLT and above, the standard ProGrade Trailering System provides up to 14 available camera views — including a transparent trailer view — along with an in-vehicle trailering app that streamlines hitching, departure checklists, and trailer tire monitoring. Additional standard trailering tech across the lineup includes Trailer Sway Control, Hill Start Assist, and an integrated trailer brake controller.
The Sierra 2500HD and 3500HD are available in Regular Cab, Double Cab, and Crew Cab configurations with a standard 6.8-foot or long 8.1-foot bed. The 3500HD adds a dual-rear-wheel option for maximum stability under the heaviest loads. Standard safety features across the lineup include forward collision alert with automatic emergency braking, lane departure warning, pedestrian detection, and automatic high beams.
Ready to explore the 2026 GMC Sierra 2500HD or 3500HD? Browse our new Sierra HD inventory at Legacy GMC of Waxahachie, or call our sales team at 214-903-4359 to discuss your towing requirements. You can also value your current trade-in to see how it can offset the cost of your next heavy-duty truck.
