Mack debuts vocational truck for diverse environments

Mack Trucks recently unveiled the all-new Mack Keystone at the Las Vegas Motor Speedway. A purpose-built Class 8 vocational tractor designed to thrive in the most demanding on- and off-road environments, the Keystone combines terrain versatility with the latest advancements in driver comfort, safety technology and Mack’s legendary durability, Mack reported.

In addition to North American markets, the Keystone will be available in select international markets, marking the first time Mack has offered this class of vocational tractor in Latin America. The all new truck will be available for order through Mack’s dealer network in Q3 2026.

“The Mack Keystone represents our commitment to providing customers in agriculture, construction and vocational markets with a truck that’s as capable on rough terrain as it is on the highway,” Stephen Roy, Mack president, said in a news release. “Named after the Keystone State of Pennsylvania, where all Mack Class 8 models for North America and export are assembled at Lehigh Valley Operations in Macungie, the Keystone continues Mack’s tradition of building rugged, reliable trucks that work as hard as the people who drive them.”

The Keystone builds on the legacy of the Pinnacle, which has earned a reputation for durability and high customer satisfaction over its 20-plus years in Mack’s product lineup, the OEM said. The Keystone delivers the same advanced technology and safety as the Pioneer and all-new Anthem—along with the newly unveiled Mack Granite. This unified platform enables the Keystone model to offer identical comfort features, safety systems, and performance technologies while maintaining the heavy-duty characteristics essential for vocational tractor applications.

“Our customers told us they wanted a truck that could handle the toughest jobs and job sites without compromising driver comfort or modern technology,” said Jonathan Randall, president of Mack Trucks North America. “The Keystone delivers exactly that: terrain versatility to navigate challenging road conditions, combined with the best ride quality in the business.”

Terrain versatility for demanding applications

The Keystone is engineered for customers who operate in construction, agriculture, logging, livestock hauling, and other applications that require a truck capable of performing on highways and challenging off-road terrain. Key to this capability is the Keystone’s higher ground clearance, approach angle, and robust suspension system. The available Mack Maxride suspension is specifically engineered to deliver ultimate performance on the most demanding road conditions, providing best-in-class ride quality whether on highway or rough terrain.

“The Keystone is designed for terrain versatility; it thrives where the roads are unpaved, uneven or even nonexistent, then transitions seamlessly to highway driving,” said Fernando Couceiro, Mack vice president of highway trucks. “Whether you’re hauling logs out of a forest, delivering heavy equipment to a construction site or transporting agricultural goods across rural roads, the Keystone is built to handle it all.”

For the first time, Mack is offering this class of vocational tractor in both axle-forward and axle-back configurations, providing customers with greater flexibility to match their specific operational needs. The Keystone is available in three cab configurations: daycab, 44-in. sleeper and 64-in. sleeper, each offered in both axle positions. Rear axle configurations include 6x4, 8x4, and 8x6.

Driver-centric interior design

The Keystone shares its interior architecture with the Pioneer, bringing the same level of driver comfort and ergonomic excellence to vocational applications. The cab features wrap-around controls and high visibility.

“We designed every element of the Keystone interior with the driver in mind –from the wrap-around controls that keep everything within easy reach, to the ergonomic grab bars that make entering and exiting the cab safer and easier,” said Vince Lokers, Mack specialist chief designer. The interior features Mack’s signature seating with premium comfort and support, electronic braking system for easier operation, an available digital mirror system, and a flat-bottom steering wheel designed for improved belly room—a driver-requested feature that provides additional clearance. An integrated ELD plate accommodates electronic logging devices, while device holders and cord management systems keep the workspace organized.

Bold design with heritage inspiration

The Keystone features a distinctive exterior design that balances modern aesthetics with the rugged characteristics expected of a vocational tractor. The design team drew inspiration from Mack’s heritage, including design elements reminiscent of the iconic Mack R Model, while incorporating contemporary styling that aligns with Mack’s current product family.

“We designed the Keystone to look like it can handle anything because it can,” said Lukas Yates, Mack expert chief designer. “The gloss black grille bar, polished aluminum-clad bumper center and refined fender profile give the Keystone a distinctive presence that’s unmistakably Mack, while maintaining a cohesive family appearance with our Pioneer, Anthem, and Granite models.”

The Keystone introduces a new modular bumper system designed to accommodate various tow configurations while maintaining a clean, functional appearance. A new bullet lamp on the cab roof provides improved visibility and compliance contributing to the truck’s distinctive character.

Performance and reliability

The Keystone is powered exclusively by the Mack MP13 engine, delivering up to 540 horsepower and 1,950 lb.-ft. of torque to tackle the most demanding heavy-haul applications. Paired with the proven mDRIVE HD automated manual transmission, the Keystone delivers smooth, efficient power transfer in any terrain. The advanced powertrain delivers up to 6% improved fuel efficiency compared to the Pinnacle, helping customers reduce operating costs without sacrificing performance. The Keystone also offers the Mack Protect safety suite available on the Pioneer and Anthem.

To maximize uptime, the Keystone comes standard with Mack’s integrated uptime solutions, including a complimentary five-year subscription to Mack Connect, Mack’s telematics platform that provides real-time vehicle monitoring, remote diagnostics and proactive service scheduling to keep trucks on the road and productive.

“When you're operating on challenging roads, ride quality becomes even more important,” Couceiro concluded. “The Keystone’s suspension and cab engineering deliver an unmatched smooth, comfortable ride that reduces driver fatigue, even in the most demanding conditions. Combined with Mack’s legendary durability, the Keystone is built to perform mile after mile, year after year.”