New 2021 Essex 4578 Motor Home Class A - Diesel

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Essex 4578 Description

Newmar Essex Class A diesel motorhome 4578 highlights:

  • Full-Wall Slide Out
  • 30" x 72" Bunk
  • Stacked Washer and Dryer
  • Bath and a Half
  • King Bed
  • Chaise Lounge 


You will experience nothing but luxury when you step foot inside this motorhome. The full-wall slide opens up the whole coach for a more spacious living area. Once you've arrived at your destination you can relax on the 74" dormi sofa, the 74" chaise lounge, and swivel the heated captain's seats around to be a part of the conversation. The chef of the family will love this Essex's kitchen that features an all electric, flush mount induction cooktop, a stainless steel 30" GE Profile Advantium Microwave, plus a Whirlpool stainless steel 19.7 cu. ft. refrigerator. You and your spouse will have your own master bedroom with a slide out king bed, dual wardrobes, plus a Samsung LED TV. This model features a full rear bath with a 40" x 30" shower with a fold-down seat, plus a stacked washer and dryer and a wardrobe with drawers for clean towels and necessities. The mid-ship half bath will be convenient when traveling with the grandkids, plus it is right across the hall from the 30" x 72" bunk!


Pursue ultimate luxury in an Essex Class A diesel motorhome by Newmar. You will drive easy with the ultra-durable STAR foundation, Comfort Drive steering, an air leveling control system, plus memory settings for the captain's seats, mirrors, pedals, and steering column. The exterior full-paint Masterpiece is sure to turn heads as you travel to your destination, and the 20K hitch allows you to bring along the family car. Inside, you'll enjoy elegant and convenient features, such as a Sleep Number king bed, wireless charging stations, full tiled shower walls and floor, plus a central vacuum with a tool kit to keep everything clean. These motorhomes feature an impressive basement storage for all your gear, hydraulic leveling jacks to make set-up easier than ever, plus two Nova side awnings with window sensor, remote control, and LED lights that will create and inviting outdoor living space. 

Essex 4578 Specifications

Sleeps 6
Slides 3
Length 44 ft 10 in
Ext Width 8 ft 6 in
Ext Height 13 ft 4 in
Int Height 6 ft 11 in
Interior Color Dutton, Trove, Winchester, Windham
Exterior Color Dutton, Trove, Winchester, Windham
Hitch Weight 20000 lbs
Gross Weight 54000 lbs
Dry Weight 47000 lbs
Cargo Weight 7000 lbs
Fresh Water Capacity 105 gals
Grey Water Capacity 80 gals
Black Water Capacity 60 gals
Furnace BTU 50000 btu
Generator 12.5 Kw Cummins Onan
Fuel Type Diesel
Engine Cummins X
Chassis Spartan K3
Horsepower 605 hp
Fuel Capacity 150 gals
Wheelbase 292 in
Number Of Bunks 1
Available Beds King
Torque 1950 ft-lb
Refrigerator Type Whirlpool Stainless Steel
Refrigerator Size 19.7 cu ft
Convection Cooking Yes
Cooktop Burners 2
Shower Size 40" x 30"
Number of Awnings 2
Axle Weight Front 20000 lbs
Axle Weight Rear 20000 lbs
Axle Weight Tag 14000 lbs
Water Heater Type Continuous
AC BTU 45000 btu
TV Info Front Overhead 43" 4K LED TV, LR Samsung LED TV, BR Samsung LED TV
Awning Info Power w/Window Sensor, Remote Control, and LED Lights
Washer/Dryer Available Yes
Gross Combined Weight 74000 lbs
Shower Type Shower w/Seat
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.