New Mack Box Trucks For Sale in Colorado

Many Mack MD6 box trucks are spec'd at 25,995-pound GVWR, which keeps the truck under the standard CDL threshold while still allowing a full-sized 24-foot or 26-foot cargo body. That combination gives operators strong cubic capacity, a commercial-grade chassis, and easier driver staffing for local and regional delivery routes.

A common setup is the Cummins ISB 6.7-liter diesel rated around 280 horsepower paired with an Allison 2500 RDS automatic transmission. This combination is popular because it is proven in medium-duty delivery service, easy for drivers to operate, and well suited for stop-and-go applications with frequent starts, curbside unloading, and short-route cycling.

Key body features include hardwood or composite flooring, scuff protection, recessed E-track, roll-up rear doors, durable roof construction, and a liftgate sized for the freight being handled. Buyers should also check interior height, body length, rear frame construction, bulkhead protection, and whether the body uses composite or aluminum components based on expected abuse and repair priorities.

Many new Mack box trucks in this category are equipped with liftgates in the 3,000-pound to 3,300-pound range, but the right gate depends on the freight. Palletized goods, appliances, and route delivery typically benefit from a railgate or tuckunder configuration with a platform large enough for carts, pallet jacks, and mixed-stop unloading.

Colorado buyers should pay attention to route elevation, mountain grades, and seasonal conditions in addition to body size and payload. A diesel powertrain with adequate horsepower, an automatic transmission calibrated for medium-duty work, heated mirrors, and a body spec that balances tare weight with durability can make a meaningful difference in year-round delivery performance.