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If you need a truck that can handle the jobsite by day and tackle rugged terrain on the weekend, you need to check out the 2026 GMC Sierra 2500 HD AT4. It blends heavy-duty performance with off-road hardware in a package that does not ask you to compromise. For drivers in Portsmouth, NH, this truck is a compelling option if you haul trailers, tow heavy loads, or simply want the confidence of knowing your truck can handle anything the road - or trail - throws at it. What Makes the 2026 GMC Sierra 2500 HD AT4 Built for Off-Road The AT4 trim is GMC's off-road-focused package, and on the Sierra 2500 HD, that means hardware designed to perform. The 2026 GMC Sierra 2500 HD AT4 comes equipped with a factory-installed 1.5-in suspension lift, skid plates to protect key underbody components, Multimatic® DSSV Dampers, Rancho® shocks, and an off-road-tuned chassis that gives you added ground clearance when the pavement ends. These aren't cosmetic upgrades - they are functional features that make a difference when terrain gets uneven or unpredictable. The AT4 also brings a locking rear differential and hill descent control, two features that are important when you are driving on loose gravel, steep grades, or through mud. Paired with all-terrain tires, the 2026 GMC Sierra 2500 HD AT4 is engineered to go further than a standard heavy-duty truck. Heavy-Duty GMC Truck Performance You Can Count On Beyond the off-road capabilities, this is still a heavy-duty GMC truck built to work. The Sierra 2500 HD is available with powerful engine options, including a 6,6 L Duramax® diesel that delivers 470 hp and 975 lb-ft of torque, the kind of torque serious towing and hauling demands. It has a max towing capacity of 20,000 lbs for conventional trailering and 21,390 lbs for gooseneck/fifth-wheel trailering. It has a max available payload of 3,524 lbs. Interior Comfort and Technology Capability does not mean you have to give up comfort. The AT4 interior brings a well-appointed cabin with heated and ventilated front seats, power front seats with massaging features, and a modern layout. The13.4-in touchscreen keeps navigation, audio, and vehicle settings easy to manage, and available connectivity features like wireless charging and a built-in Wi-Fi hotspot keep you linked to what's important. GMC Sierra 2500 HD AT4 features extend to driver assistance and safety technologies as well, including available camera systems that make hitching trailers and navigating tight spaces significantly easier. Why the 2026 GMC Sierra 2500 HD AT4 Belongs on Your Shortlist When you need a truck that does it all - off-road readiness, serious towing, and daily drivability - the 2026 GMC Sierra 2500 HD AT4 stands out from the crowd. It is a vehicle that earns respect on every kind of terrain. Stop by or visit us to explore the 2026 GMC Sierra 2500 HD AT4 and find the right configuration for your needs. The team at Holloway GMC is ready to help drivers throughout Portsmouth, NH find the heavy-duty truck that fits their lifestyle and gets the job done right.

If you are comparing the 2026 GMC Sierra 2500 HD vs. Sierra 3500 HD, both trucks deliver the power, durability, and towing capability GMC truck owners expect. The main difference comes down to capability: the Sierra 2500 HD provides impressive heavy-duty performance for work and recreation, while the Sierra 3500 HD is designed for drivers who need maximum towing and hauling strength. At Holloway GMC, drivers can compare GMC Sierra HD trucks and find the model that best fits their towing needs, work requirements, and lifestyle. GMC Sierra 2500 HD vs. Sierra 3500 HD: Key Differences The 2026 GMC Sierra 2500 HD and Sierra 3500 HD share many features, including powerful engine options, advanced towing technology, premium interiors, and professional-grade capability. The biggest difference is how much capability you need. The GMC Sierra 2500 HD is a great choice for: Towing campers, boats, and trailers Work and recreational use Drivers who need heavy-duty capability with everyday comfort The GMC Sierra 3500 HD is designed for: Larger fifth-wheel trailers Heavy-duty towing applications Maximum payload requirements Drivers who regularly handle demanding jobs 2026 GMC Sierra 2500 HD: Versatile Heavy-Duty Capability The 2026 GMC Sierra 2500 HD offers the strength needed for many towing and hauling tasks while maintaining the comfort and versatility drivers want from a daily truck. It is ideal for customers who need a capable pickup for: Weekend adventures Equipment hauling Towing recreational vehicles Professional work applications For many drivers, the Sierra 2500 HD provides the right balance of performance, comfort, and capability. 2026 GMC Sierra 3500 HD: Maximum Strength for Heavy-Duty Jobs The 2026 GMC Sierra 3500 HD is built for drivers who need additional capability beyond what a typical heavy-duty truck provides. With increased towing and hauling strength, the Sierra 3500 HD is a strong option for customers who regularly tow heavy trailers, fifth-wheel campers, or large equipment. If your truck is used for the toughest jobs, the Sierra 3500 HD provides the extra capability you need. GMC Sierra 2500 HD vs. Sierra 3500 HD Comparison Feature GMC Sierra 2500 HD GMC Sierra 3500 HD Best For Heavy-duty versatility Maximum towing capability Ideal Driver Work, recreation, towing Heavy-duty and commercial use Strength Powerful towing performance Increased hauling capability Driving Style Everyday truck with heavy-duty power Built for demanding workloads Which GMC Sierra HD Truck Should You Choose? The right choice depends on how you use your truck. Choose the 2026 GMC Sierra 2500 HD if you want a truck that offers: Strong towing capability Everyday comfort Versatility for work and recreation Choose the 2026 GMC Sierra 3500 HD if you need: Maximum towing performance Greater hauling capability A truck built for the heaviest jobs Visit Holloway GMC to compare available Sierra HD trucks and find the GMC pickup that fits your needs. Frequently Asked Questions What is the difference between the GMC Sierra 2500 HD and Sierra 3500 HD? The main difference is capability. The Sierra 3500 HD is designed for higher towing and payload demands, while the Sierra 2500 HD provides excellent heavy-duty performance for many work and recreational needs. Is the GMC Sierra 3500 HD better for towing? The Sierra 3500 HD is the better choice for customers who frequently tow heavy trailers, fifth-wheel campers, or large loads. The Sierra 2500 HD is a great option for many everyday towing needs. Should I buy a GMC Sierra 2500 HD or Sierra 3500 HD? The best choice depends on your needs. The Sierra 2500 HD is ideal for drivers who want a balance of capability and comfort, while the Sierra 3500 HD is designed for maximum towing and hauling performance.

Shopping for a truck that can go the distance, tow the heaviest of loads, and has all the convenience features and amenities necessary to ensure that all your time on the road feels like a luxury experience? You'll love the new 2025 GMC Sierra HD. This truck has the safety features, power, and amenities to make life on the road luxurious, accommodating, and more convenient. more The Options The new GMC Sierra HD is available in several trims: the PRO, the SLE, the SLT, the AT4, the Denali, the AT4X, and the Denali Ultimate. Drivers who want a truck that's the epitome of luxury and power will love the Denali Ultimate, the highest trim available with the most amenities and features. This trim includes all the Denali standard features plus customization options. It's equipped with a Duramax 6.6L Turbo-Diesel V8 engine with an Allison 10-speed automatic transmission, an available auxiliary trailer camera, an exclusive Alpine Umber interior, full grain leather seating, open pore Palsao wood finishes, and massage seats with 16-way power settings. It also has a Signature Vader chrome grille, 20-inch machined aluminum wheels, and illuminated power assist steps. The Advanced Trailering Technology Trailering and towing have never been easier thanks to the GMC Sierra HD's advanced trailering tech system. The ProGrade Trailing Tech consists of several intelligent technologies that will make hitching and towing heavy loads seamless and improve driver confidence and visibility throughout the process. It also has up to 14 different available camera views and adaptive cruise control with a trailering system that simplifies the towing process. The Driver Amenities When it comes to driver amenities, the new Sierra HD doesn't disappoint. Drivers can enjoy an added level of luxury and comfort in the 16-way power front seats that have massage capabilities, to make life on the road and even time in traffic feel stress-free. The interior is outfitted with top-of-the-line materials like full-grain leather. The Denali Ultimate trim even has unique laser edge topographical map patterns. These trucks also have best-in-class crew cab front head and legroom, ensuring that passengers of all heights can enjoy time spent in the front or back. The Technology These trucks have the latest in GMC vehicle technology and feature a 13.4-inch digital center tablet-style touchscreen that serves as the centerpiece of the cabin, a 15-inch diagonal multicolor head-up display that projects vehicle information onto the windshield, and a 12-inch diagonal color driver information center where you can access vehicle information. If you want a truck that knows no limits but also has an added level of luxury, you'll love everything about the new GMC Sierra HD lineup. Visit us today at Holloway GMC in Portsmouth, NH to see the new GMC Sierra HD models in person and begin the custom order process.