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The Mack Pinnacle Series is built to conquer heavy loads, steep grades and long hauls. These Mack trucks feature a high-horsepower and fuel-efficient Mack MP engine that delivers low-end torque. Our highway trucks are built for heavy-duty applications thanks to our lightweight-but-strong Mack Advantage chassis. And with leading electronics; an ergonomic dashboard; a quieter, reinforced cab and plush interiors, our highway trucks are built to make you feel at home on the road. The Pinnacle Series maintains the option of removing the sleeper box on its sleeper models. You can reconfigure your sleeper into a DayCab, giving your Mack truck a second life for local hauling.