This 2027 Peterbilt 579 UltraLoft is built for premium long-haul comfort and fuel-efficient highway performance, featuring an 80" UltraLoft sleeper with a Premier Interior in Sterling Gray and a spacious double bunk setup with ladder access. Powered by a Cummins X15 Efficiency Series engine rated at 500 HP and paired with an Eaton Endurant automated 12-speed transmission, this truck delivers smooth shifting, dependable power, and excellent performance for over-the-road applications. It rides on a 12,350 lb front axle with 40,000 lb rear tandems, low air leaf suspension, and fuel-efficient 2.79 rear gearing for a smooth, stable highway ride. Full air disc brakes provide confident stopping power and added control, while predictive cruise control helps maximize efficiency. The 24" air slide fifth wheel adds flexibility for a wide range of trailer applications. Dual aluminum fuel tanks, including a 135 gallon right-side tank and 120 gallon left-side tank, provide excellent range between stops. Inside, drivers will appreciate Ultraleather seating, refrigerator, fuel-fired sleeper heater, premium pocket spring mattresses, SmartSound insulation package, EPIQ Aero package, 7" infotainment display with Apple CarPlay, premium speaker system with subwoofer, inverter with shore power, TV provisions, and a 15" digital display cluster built for comfort and productivity. Let one of our sales professionals tell you about any of our Model 579 UltraLofts in inventory as well as the great financing options currently available. Delivery available.