SOLD USED 2020 Newmar Mountain Aire 4551

The 2020 Newmar Mountain Aire 4551 is an exquisite luxury Class A diesel pusher motorhome, representing the pinnacle of residential comfort, sophisticated design, and robust performance. As a flagship model in Newmar's prestigious Mountain Aire line, the 4551 floor plan is an engineering marvel, featuring an innovative layout, often including a bath-and-a-half configuration and a unique living arrangement, making it an exceptional choice for full-time RV living or unparalleled cross-country adventures.

If you're searching for a late-model used diesel motorhome that offers a truly high-end experience, cutting-edge features, Newmar's legendary quality, and a powerful engine, the 2020 Newmar Mountain Aire 4551 is an outstanding option in the pre-owned RV market.

2020 Newmar Mountain Aire 4551 Specifications: Experience Unrivaled Luxury on the Road

Overview & Key Features:

• Elite Floor Plan (4551): The 4551 layout is a highly coveted 45-foot motorhome often featuring a mid-ship half-bath (for guests) and a luxurious full master bathroom in the rear. It typically boasts an expansive living area with versatile seating, a gourmet kitchen, and a private master bedroom, designed for ultimate comfort and functionality.
• Quad Slide-Out Design: Equipped with four significant slide-outs (often including a full-wall slide, living room slide, and master bedroom slide), dramatically expanding the interior footprint for an incredibly open, spacious, and residential feel. This maximizes diesel pusher interior space.
• King-Size Bed: The private rear master bedroom typically features a comfortable king-size bed (often a Sleep Number® R5 Radius Corner Air Mattress), ensuring a restful night's sleep on your travels.
• Residential Appliances & Amenities: Designed with home-like features throughout, including a residential refrigerator, induction cooktop, and premium finishes, for unparalleled convenience and luxury.
• Four-Season Capable: Newmar's robust construction includes superior insulation, hydronic heating, and advanced climate control systems for comfortable extended-season RVing, even in extreme temperatures.

Chassis & Engine: Uncompromising Power and Superior Ride

• Chassis: Built on the robust Spartan® K3 Tag Axle Chassis with Passive Steer technology (on 45-foot models) or Freightliner® Tag Axle XCR Chassis (verify on specific unit). Both provide a sturdy foundation, excellent handling, and an exceptionally smooth ride for Class A diesel motorhomes.
• Suspension: Comfort Drive™ Steering system with Passive Steer technology (on tag axle chassis) for reduced driving fatigue and precise control. Air ride suspension and Bilstein® shock absorbers provide a luxurious ride.
• Engine: Powered by a formidable Cummins® X12 500 HP Diesel engine (for Spartan K3) or Cummins® L9 450 HP Diesel engine (for Freightliner XCR).
  
  • Horsepower: 450 HP (L9) or 500 HP (X12).
  • Torque: 1,250 lb-ft (L9) or 1,645 lb-ft (X12) – provides immense pulling power for climbing and heavy towing.
• Transmission: Allison® 4000 MH 6-speed Automatic Transmission.
• Fuel Capacity: Large 150-gallon diesel fuel tank.
• DEF Tank: 15-gallon DEF tank.
• Towing Capacity: Impressive 15,000 lb. trailer hitch capacity with 7-pin connector.
• Brakes: Full air ABS brakes with auto slack adjusters and disc brakes.
• Leveling System: HWH® Hydraulic Automatic Leveling Jacks with Touchpad Controls for quick and stable setup.

Dimensions & Weights:

• Exterior Length: Approximately 44 ft 11 in. This makes it a substantial large diesel RV.
• Exterior Width: 8 ft 5.5 in (101.5 inches).
• Exterior Height (with A/C): 12 ft 10 in to 13 ft 0 in.
• Interior Height: 6 ft 11 in (83 inches).
• GVWR (Gross Vehicle Weight Rating): 49,000 lbs.
• GCWR (Gross Combined Weight Rating): 64,000 lbs.
• Unloaded Vehicle Weight (UVW): Approximately 38,000 - 40,000 lbs (varies with options).
• Exterior Storage: Massive pass-through basement storage compartments with power cargo trays.

Tank Capacities: Designed for Extended Living & Boondocking

• Fresh Water Capacity: 105 gallons (generous for boondocking or extended stays).
• Grey Water Capacity: 75 gallons.
• Black Water Capacity: 55 gallons.
• LP Tank Capacity: 32 gallons (approximately 136 lbs).
• Water Heater Type: Hydronic Zone Diesel Heat with Continuous Hot Water (Oasis or similar, a premium feature providing endless hot water and quiet, even coach heating).

Appliances & Utilities: Uncompromising Residential Comfort

• Refrigerator: Whirlpool® 19.7 cu ft Residential Refrigerator with icemaker and water dispenser (standard).
• Cooking: True Induction Cooktop. Fisher & Paykel® Dishwasher in a drawer (optional).
• Microwave Oven: Convection Microwave.
• Furnace BTU: 50,000 BTU hydronic heat system.
• AC BTU: Dual 15,000 BTU Penguin™ Heat Pump Air Conditioners (total 30,000 BTU). Optional third 15M Penguin™ Heat Pump A/C with Energy Management System for maximum cooling.
• Electrical Service: 50-Amp Service with Power Rewind Reel with 50' Cord.
• Generator: 10.0 kW Onan Quiet Diesel Generator (on power slide tray). Automatic Generator Start.
• Inverter: 2,800-watt Pure Sine Wave Inverter (powers residential fridge and most outlets).
• Awnings: Girard® Nova Power Side Awnings with Wind Sensor (dual awnings). Power Entrance Door Awning. Slideout Awnings.
• Entertainment: Front 50" Samsung® 4K LED TV on power lift. 43" Samsung® LED TV in Living Area. 32" Samsung® LED TV in Bedroom. Bose® SoundTouch 300 Sound Bar. Blu-ray/DVD Player. Exterior Entertainment Center with 43-inch Samsung LED TV and Soundbar (optional). Winegard Trav'ler satellite dish (optional).
• Washer/Dryer Prep: Standard prep for stackable washer/dryer units.
• Central Vacuum System with Tool Kit (optional).

Construction & Exterior: Newmar's Legendary Build Quality

• Newmar Quality: STAR Foundation (a strong steel substructure for superior ride, handling, and a quieter ride). Full-Paint Masterpiece™ Finish with Clearcoat Finish & Diamond Shield Protection on Front Cap. Gelcoated Fiberglass Exterior Sidewalls, Front & Rear Caps. Aluminum-Frame Sidewalls & Roof Construction (16" on center). BriteTEK™ Roof with Walkable Decking.
• Windows: Frameless Double-Pane Tinted Safety-Glass Windows (for superior insulation and noise reduction).
• Entry: Entrance Door with Automatic Steps. Lighted Assist Handle. Keyless entry. Power baggage door locks.
• Mirrors: Convex Exterior Mirrors with Remote Control, Defrost & Side-View Cameras.
• Other: Rear ladder. Exterior shower. Pass-through storage with power slide-out trays.

Interior Features: Unrivaled Residential Comfort and Style

• Flooring: Polished Porcelain Tile throughout living area, kitchen, and bathroom.
• Cabinetry: Hardwood Cabinetry (e.g., Bermuda Glazed Maple, Wicker Glazed Maple, Sable Glazed Maple). Soft-close cabinet drawers. Hidden hinges. Backlit carved wood slideout fascia.
• Living Area: Flexsteel® Ultrafabric Sofa (hide-a-bed or 87-inch bunk sofa). Flexsteel® recliners or theater seating. Heated Captain's Chairs. Hide-a-Leaf Dinette with two solid wood chairs (or optional buffet dinette/combination desk/dinette). Power-adjustable pedals. Power windshield day/night shades.
• Kitchen: Gourmet Kitchen with solid surface countertops, custom tile backsplash, large stainless steel sink with pull-down faucet. Pantry. Dishwasher (optional).
• Bedroom: King-size bed (optional Sleep Number® adjustable mattress). Full-wall wardrobe with safe. Dresser with drawers.
• Bathroom: Master Bath with Sentrel™ Acrylic Shower Walls with Glass Door & skylight. Water-conserving shower technology. Polished solid surface countertop. Porcelain macerator toilet. Half bath with porcelain toilet. Power fan in bathrooms.
• Cockpit: Driver and passenger seats with Six-Way Power, Power Lumbar, and Footrest. Xite Dash Radio with Navigation System. Steering wheel with controls.
• Convenience: Safe (optional). 110 Volt Heat Pads for Holding Tanks. Demand Water System. Sewage Holding-Tank Rinse. Water Filter for Entire Unit.