Never Settle.

You’ve earned the right to explore new places and meet new people. We’re here to make sure your journey is safe, smooth, and always first class. As the industry leader in chassis-centric innovations, improving the safety culture is core to Spartan RV Chassis. That’s why Newmar has partnered with us to raise the bar on safety on their coaches.

The Newmar Essex is available exclusively on the Spartan K3 605 chassis. Spartan chassis is designed, engineered, and made in America with the finest components creating a premier foundation for the most discerning RV makers and owners.

Spartan RV makes the only chassis built exclusively for motorhomes. We didn’t take the easy route and modify a truck chassis for our partners at Newmar. We knew they wanted an unmatched ride that was as smooth and quiet as it was invigorating and well-appointed. So, we built them the unique K3 605 chassis from the ground up. The highest-quality materials provide reliability and dependability, along with nationwide service, and the best warranty in the business.

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Premium Features

  • Comfort Drive™ steering assist system w/ variable driver’s effort control feature
  • Power tilt & telescoping steering column
  • Independent front suspension
  • Electronic suspension control system with self-leveling feature including air compressor for extended stays
  • Automatic heated moisture ejectors with color-coded lanyards
  • Side-mounted service center
  • Connected Coach™ digital dash display
  • Passive steer tag axle
  • Heavy Haul trailer mode
  • 3-stage engine compression brake
  • 20,000 lb towing capacity
  • SMART heated steering wheel w/ leather details & phone controls
  • Spartan Passive Keyless Start
  • Suspended adjustable pedals
  • Memory setting controls for seat, mirrors, pedals, & steering column for drivers one and two
  • Air disc brakes at all wheel positions
  • Available CURT Spectrum™ trailer brake control
  • K3 605 Chassis



Peak HP

605 hp @1800 RPM


292″ + 48″ tag

Towing Capacity

20,000 lb



Safety Innovations

Spartan Advanced Protection System – Essex

Spartan Advanced Protection System® is the industry’s first and only comprehensive safety system engineered to keep your Newmar King Aire on the road, and safe… to enjoy every adventure.

  • Spartan Safe Haul™ The industry’s only factory-chassis integrated air supply for tow vehicle brake systems.
  • OnGuardACTIVE, Collision Mitigation with Adaptive Cruise Control alerts the driver of potentially dangerous driving scenarios and adjusts speed to maintain a safe following distance.
  • Electronic Stability Control (ESC) helps the driver maintain control of the coach in extreme steering maneuvers by automatically controlling individual brakes to help keep the coach moving in intended direction.
  • Automatic Traction Control (ATC) helps the driver maintain traction under the drive axle tires in slippery conditions by automatically applying brakes on the wheel end that is slipping. This helps transfer power to the wheel end with more traction.
  • Tire Pressure Monitoring System (TPMS) displays tire pressure and temperature for individual tires. The system will alert the driver if any tire pressure or temperature exceeds set thresholds. The system is expandable to monitor towed vehicles as well.
  • Mobileye, Lane Departure Warning with sign and pedestrian recognition warns the driver with visual and audible alerts. The system will alert the driver in real time, so necessary corrections can be made.
  • Connected Coach


Spartan Connected Coach


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Service Guides

Service Manuals

Wiring Manuals

Alternative Fuels


Ford Transit

RAM ProMaster