Newmar Mountain Aire 4551 Highlights:

• Cummins X 525 hp diesel with Allison 4000 MH
• 105‑gal fresh water and 50,000 BTU furnace
• Three slides, king bed, and 1.5 baths
• Exterior entertainment and exterior freezer included

The Newmar Mountain Aire 4551 is a premium tag‑axle diesel coach built for travelers who want maximum power, luxury, and space. Its Cummins X engine delivers 525 horsepower and 1,695 lb‑ft of torque, paired with an Allison 4000 MH transmission for confident performance on long hauls and mountain grades. Inside, the 4551 features three slideouts, a king bed, and a 1.5‑bath layout that supports extended travel. With an 800‑amp‑hour battery system, large tank capacities, and upscale amenities including an exterior entertainment center and freezer, the Mountain Aire 4551 offers a refined and capable luxury motorhome experience.

Newmar Mountain Aire 4551 Highlights:

• Cummins X 525 hp diesel with Allison 4000 MH
• 105‑gal fresh water and 50,000 BTU furnace
• Three slides, king bed, and 1.5 baths
• Exterior entertainment and exterior freezer included

The Newmar Mountain Aire 4551 is a premium tag‑axle diesel coach built for travelers who want maximum power, luxury, and space. Its Cummins X engine delivers 525 horsepower and 1,695 lb‑ft of torque, paired with an Allison 4000 MH transmission for confident performance on long hauls and mountain grades. Inside, the 4551 features three slideouts, a king bed, and a 1.5‑bath layout that supports extended travel. With an 800‑amp‑hour battery system, large tank capacities, and upscale amenities including an exterior entertainment center and freezer, the Mountain Aire 4551 offers a refined and capable luxury motorhome experience.