The Sierra 2500 HD is offered in a compelling suite of trims.

Pro, SLE, SLT, AT4, AT4X, Denali, and Denali Ultimate—each tailored for specific driving priorities. The Pro trim is the work-ready foundation, with two- or four-wheel-drive. It delivers stately functionality without extravagance. The SLE elevates that base with enhanced convenience and versatility, integrating a 13.4-inch infotainment touchscreen and traction-select features with Tow/Haul optimization.

Striking a harmony between everyday utility and modern refinement. With SLT, the Sierra steps into comfort and sophistication. This trim adds refined touches such as leather-appointed heated and ventilated front seats, a ProGrade® Trailering System, Remote Start, and dual-zone automatic climate control Ideal for drivers who require both luxury and capability. The AT4 is engineered for off-road ambition. It features an Autotrac® two-speed transfer case, hill-descent control, body-color bumpers, a spray-on bedliner, and robust suspension tuning.

Ready for Louisiana’s trails or unpaved paths. Adaptive cruise control adds modern ease on any surface. For those desiring maximum exclusivity, Denali exudes upscale excellence, and Denali Ultimate represents the apex of luxury combining premium materials, exclusive design cues, and the most advanced comfort and audio systems available. While detailed specs align with GMC's luxury portfolio, these trims naturally include the rich authenticity of grain-leather, exquisite trim accents, and refined ambiance.

At its core, the Sierra 2500 HD offers two powerhouse engines. The standard 6.6L V8 gasoline engine generates 401 hp and 464 lbs.-ft. of torque; the optional 6.6L Duramax® V8 Turbo-Diesel delivers a startling 470 hp and 975 lbs.-ft. of torque, both paired with the renowned Allison 10-speed automatic and available in 2WD or 4WD. Towing prowess varies with configuration and options. A conventionally hitched Crew Cab Duramax® model can manage up to 20,000 lb., while the Regular Cab with gooseneck or fifth-wheel setup reaches up to 22,390 lb. Models equipped with the Max Trailering Package including Pro, SLE, and SLT can extend that towing threshold to about 20,000 lb.

Crafted for occupants first and foremost, the Sierra cabin especially in Crew Cab—boasts Best-in-Class head and legroom, enveloping occupants in comfort. Cargo volume ranges from approximately 69.5 to 83.5 cu. ft., depending on cab and bed configurations, with the long-bed Crew Cab offering the upper range of space. At higher trims, interior finishes are elevated rich leather, authentic trim, contrast stitching, and available massaging front seats create an ambiance worthy of a luxury sedan, while smart design ensures storage and functionality are never compromised.

At the technological heart of the cabin lies the standard 13.4-inch GMC Premium Infotainment System with smartphone integration and Google compatibility ensuring seamless connectivity. Trailering confidence comes from the ProGrade® Trailering System, which adds 14 camera views, transparent trailer visualization, an in-vehicle trailering app, and hitch guidance technologies tailored for towing in the bayous or across state lines.

The Sierra’s standard offerings include GMC Pro Safety, featuring Forward Collision Alert, Automatic Emergency Braking, Lane Departure Warning, IntelliBeam® automatic high beams, and a Rear Vision Camera—fundamental for peace of mind. Higher trims layer on advanced aids such as Adaptive Cruise Control with towing logic, a Rear Camera Mirror, Hitch View, and additional alerts.

For discerning drivers in HAMMOND and surrounding parishes, Ross Downing GMC invites you to experience the 2025 Sierra 2500 HD firsthand. Whether your priorities lie in unmatched towing strength, elevated comfort, or refined capability, this truck delivers with authority. Visit the showroom in HAMMOND to feel the leather, gauge the dimensions, and command the road with Southern confidence.