ALLENTOWN, Pa. — Mack Defense has unveiled its line-haul hybrid-electric tractor prototype developed under the U.S. Army’s Common Tactical Truck (CTT) program at the AUSA 2026 Annual Meeting and Exposition. Derived from the commercially proven Mack Granite heavy-duty truck platform, the prototype is engineered to address the critical challenges of contested logistics by reducing fuel consumption, enhancing vehicle survivability, and delivering high-capacity exportable electrical power to forward-deployed forces.
The Common Tactical Truck effort aims to replace aging legacy heavy tactical fleets—including the M915 Line Haul Tractor and M1088 Medium Tactical Vehicle—with a modern, common chassis architecture. Mack Defense’s hybrid solution integrates a high-efficiency diesel-electric powertrain with drive-by-wire controls, advanced driver-assistance systems (ADAS), and an autonomy-ready electronic backbone. By generating off-board electrical power, the platform functions as a mobile microgrid capable of powering command posts, sensor arrays, and energy storage systems in austere operational environments without requiring dedicated generator sets.
TECHNICAL SPECIFICATIONS: MACK DEFENSE CTT HYBRID LINE HAUL TRACTOR
* System Classification: Heavy Tactical Logistics Tractor / Common Tactical Truck (CTT) Prototype
* Prime Contractor: Mack Defense (Allentown, Pennsylvania)
* Commercial Base Platform: Militarized Mack® Granite® heavy-duty commercial chassis
* Primary Customer & Program: U.S. Army Program Executive Office Combat Support & Combat Service Support (PEO CS&CSS) / CTT Initiative
* Powertrain & Energy Architecture:
* Primary Powerplant: 13-Liter Mack MP8 diesel engine paired with an integrated electric motor/generator unit
* Energy Storage & Exportable Power: High-density battery array delivering exportable AC/DC power for field microgrids, radar systems, and tactical C4ISR nodes
* Drivetrain: Mack mDRIVE™ automated manual transmission optimized for hybrid energy management
* Contested Logistics & Mobility Features:
* Fuel Efficiency: Reduced fuel burn extends operational radius and minimizes vulnerable sustainment supply lines
* Silent Watch Operations: Powers onboard electronics and auxiliary systems purely on battery power to suppress acoustic and thermal signatures
* Axle & Suspension Configuration: Ruggedized heavy-duty axles, increased ride height, and tactical all-wheel-drive capability
* Autonomy & Control Architecture:
* Control Interface: Drive-by-wire electronic steering and braking controls
* Safety & Assistance: Advanced Driver Assistance Systems (ADAS) with active braking, collision avoidance, and adaptive cruise control
* Autonomous Capabilities: Open architecture designed for seamless future integration into leader-follower autonomous logistics convoys
* Sustainment & Lifecycle Advantage: High commercial commonality with civilian Mack Granite supply chains, reducing total cost of ownership and parts burden
