New 2020 Mountain Aire 4559 Motor Home Class A - Diesel

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Mountain Aire 4559 Description

Newmar Mountain Aire Class A motorhome 4559 highlights:

  • King Bed
  • Exterior Shower
  • Three LED TV's
  • CPAP Storage


You won't be disappointed with all that this Mountain Aire diesel motorhome has to offer! From the walk-through bathroom featuring a double vanity sink, a linen closet, and 50" x 34" shower to the rear private bedroom including a king-size bed, a Samsung LED TV, a wardrobe with sliding doors, and a Splendid stackable washer/dryer, plus there is even a safe and a CPAP storage area. The exterior shower will also come in handy after a muddy excursion outdoors and if you add the optional exterior entertainment center then you can watch your favorite movie under the stars. The front passenger seat is even equipped with a work station and footrest for you to get some work done if needed!


You will be creating your own classic beauty when you select Newmar's Mountain Aire Class A diesel motorhome for your traveling home. This luxury coach tells the world that you have arrived, and you have impeccable taste! Powered by a 500 Hp Cummins® engine atop a Freightliner or Spartan chassis you can go just about anywhere.  They are also built on an ultra-durable STAR foundation for a quieter ride and come standard with the Comfort Drive adaptive steering with Passive Steer technology. Inside each model you will find an impressive living space including fantastic entertainment features like a retractable Samsung 50" 4K LED TV, a Bose 300 SoundTouch soundbar, and a Sony Blue-ray player. You will also love the appealing refreshed tile floor with radiant electric heat, and the elegant decorative touch of the designer feature ceiling. It's time you do traveling the right way with one of these Mountain Aire Class A diesel motorhomes!

Mountain Aire 4559 Specifications

Sleeps 5
Slides 4
Length 44 ft 10 in
Ext Width 8 ft 6 in
Ext Height 13 ft 2 in
Int Height 6 ft 11 in
Interior Color Artisan, Barnsley, Palisade, Windsor
Exterior Color Artisan, Barnsley, Palisade, Windsor
Hitch Weight 15000 lbs
Gross Weight 54000 lbs
Dry Weight 45200 lbs
Cargo Weight 8800 lbs
Fresh Water Capacity 105 gals
Grey Water Capacity 65 gals
Black Water Capacity 45 gals
Furnace BTU 50000 btu
Generator 12.5 KW Cummins Onan
Fuel Type Diesel
Engine Cummins ISX
Chassis Spartan K3
Horsepower 500 hp
Fuel Capacity 150 gals
Wheelbase 294 in
Available Beds King
Torque 1645 ft-lb
Refrigerator Type Whirlpool
Refrigerator Size 19.7 cu ft
Convection Cooking Yes
Cooktop Burners 2
Shower Size 40" x 40"
Number of Awnings 2
Axle Weight Front 20000 lbs
Axle Weight Rear 20000 lbs
Axle Weight Tag 14000 lbs
LP Tank Capacity 22 gals
AC BTU 45000 btu
TV Info Cab 43" Samsung LED, LR 50" Samsung LED, BR Samsung LED
Awning Info Nova Side
Washer/Dryer Available Yes
Gross Combined Weight 69000 lbs
Shower Type Neo-Angled
Electrical Service 50 amp

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Newmar is a company built around the Christian faith, specifically the beginning of the Mennonite faith in 1525 under the guidance of Ulrich Zwingli, and the founding of the Amish fellowship under Jacob Amman in 1693.


At Newmar, we believe that a motor coach is more than just a vehicle, it’s a passport to countless hours of fun and a lifelong memories taken from quality time spent with family and friends.


For over 50 years, we’ve applied our principles to the creation of motor coaches that have allowed people all over the world to live the RV lifestyle. And we’ll continue to so for countless generations to come. It’s why we take pride in every rivet, weld, and mechanical function.