New 2026 Mack Box Trucks For Sale in Colorado

New 2026 Mack box trucks are built for dry freight, route delivery, retail distribution, moving, and service applications where body security and cube matter as much as payload. In this segment, the Mack MD6 is a common fit, especially in under-CDL 25,995-lb GVWR spec. That makes it attractive for fleets trying to maximize cargo capacity without moving drivers into CDL-required operation. Buyers comparing box trucks in Colorado often focus first on body length, liftgate capacity, and door configuration because those choices have more day-to-day impact than the badge on the hood.

A typical new Mack box truck in this class is powered by the Cummins ISB6.7 diesel, commonly rated around 260 to 280 horsepower, paired with an Allison 2500 RDS 6-speed automatic. That combination is well known in medium-duty delivery work for predictable serviceability and easy driver onboarding. Many units are spec'd with 24-foot to 26-foot dry van bodies, including moving-van and straight truck cargo box setups. Common body features include composite sidewalls, hardwood flooring, aluminum or stainless rear framing, roll-up rear doors, recessed E-track, scuff liners, dome lighting, and one-piece roofs. Liftgates are also common, with 3,000-lb to 3,300-lb capacity platforms frequently used for palletized freight, appliances, and final-mile work.

The right spec depends on how the truck will load and unload. A moving-body configuration prioritizes interior cube and wall protection, while a dry freight body may be set up for more generalized route delivery. Two rows of E-track, bulkhead reinforcement, and durable scuff protection are valuable if cargo shifts or mixed freight are part of the job. Liftgate selection matters too. Platform size, cart stops, and usable capacity at the edge of the platform affect real productivity more than headline rating alone. In Colorado, altitude and grades also make powertrain calibration, cooling performance, and braking feel worth evaluating, especially for fleets running Front Range delivery routes into hillier terrain.

For buyers comparing new Mack box trucks, the key questions are usually operating class, body builder quality, and application-specific durability. Confirm the exact GVWR, wheelbase, body inside height, and rear opening dimensions before deciding. Look closely at floor construction, wall material, and rear frame corrosion resistance if the truck will see high cycle loading. Mack's medium-duty platform appeals to operators who want a straightforward diesel box truck with familiar components, automatic transmission availability, and vocational-ready body options that suit furniture delivery, parcel work, lease fleets, and regional commercial delivery.