The 2026 Mack MD Series redefines the standard for medium-duty performance. Built with Mack’s legendary strength and engineered precision, these trucks deliver the perfect balance of power, comfort, and configurability. Whether hauling equipment through Lake Worth Beach, FL, or managing regional deliveries, the MD Series embodies Mack’s core promise: durability with purpose.
Wheelbase Options for Every Application
Every business operates differently — and Mack designed the MD Series to adapt.
With wheelbase options ranging from 151 to 274 inches, operators can tailor each truck precisely to its mission.
- MD6 (Class 6) features a GVWR of 25,995 lb., ideal for urban delivery or service applications that need agility without requiring a CDL.
- MD7 (Class 7) extends capability with a GVWR of 33,000 lb., delivering the strength for heavier payloads and municipal or construction tasks.
Shorter wheelbases excel in tight city routes around Lake Worth Beach, while longer frames offer the stability and space needed for heavier or specialized bodies — from box and reefer configurations to flatbeds and dumps.
Suspension Systems Engineered for Comfort and Control
Driver comfort and load stability are at the heart of every MD Series truck. The standard dual-airbag cab suspension minimizes vibration and fatigue, while the optional Mack MaxLite AirRide rear suspension ensures exceptional ride quality across rough or uneven roads.
For operators who prioritize simplicity and heavy-load strength, Mack’s multi-leaf spring rear suspension provides unwavering reliability under pressure. Regardless of configuration, each MD truck is tuned to combine precise handling with the resilience that defines the Bulldog badge.
Powertrain Options Tailored to Your Business
Under the hood, both the MD6 and MD7 are powered by the proven Cummins B6.7 diesel engine, available in Efficiency and Performance Series calibrations.
- Horsepower: 220 – 300 hp
- Torque: 560 – 660 lbs.-ft.
Power is paired with Allison automatic transmissions renowned for smooth, dependable operation:
- MD6: Allison 2500HS or 2500RDS
- MD7: adds the heavy-duty 3000RDS option for increased torque capacity
The result is a drivetrain engineered for endurance — one that transitions seamlessly from city streets to highway hauls.
Mack further reinforces the platform with 110,000 PSI frame rails on the MD6 and 120,000 PSI rails on the MD7, ensuring unmatched structural integrity mile after mile.
Customization that Works for You
The MD Series was designed to be Body Builder Ready, with clean back-of-cab packaging and clear-frame rail space to accommodate any vocational body.
From powder-coated steel wheels and grated entry steps to adjustable driver seating and overhead storage, every detail reflects Mack’s attention to real-world functionality.
Inside, the driver-focused cab includes ergonomic controls, tilt-telescoping steering, available air-ride seats, and the premium Mack Command Steer-inspired dash layout. Optional Bluetooth®, USB, and telematics integration (via Geotab®) enhance productivity and uptime monitoring for fleet operators.
For maximum personalization, Mack’s digital truck configurator allows fleets to design every element — from wheelbase and cab trim to suspension and transmission — ensuring each MD Series truck perfectly fits its role.
Built for Growth
From light distribution to regional construction fleets, the 2026 Mack MD Series delivers confidence with every shift. Combining rugged Mack engineering with modern refinement, it’s a medium-duty truck built not just to perform, but to grow with your business.
Experience the Mack MD Series at First Fleet Truck Sales
For businesses in Lake Worth Beach, FL, and beyond, the Mack MD Series represents a new era of strength and sophistication.
Visit First Fleet Truck Sales to explore configurations, request a quote, or customize a model that’s ready to take your operation further.
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