Never Settle.

You’ve worked hard and earned the ability to explore new places and meet new people on your time. 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 in is core to Spartan RV Chassis. That’s why Newmar has partnered with us to raise the bar on the safety of their coaches.

The Newmar King Aire is built exclusively on the Spartan RV Chassis K3 605 chassis. Designed, engineered, and made in America with the finest components creating a premier foundation for the most discerning RV makers and owners.

Spartan RV Chassis 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 and uncompromising durability that was as smooth and quiet as it was safe and well-appointed. So, we built them the unique K3 605 chassis from the ground up. The highest-quality materials provide reliability and dependability, and constant innovation means you’re safe & secure. Spartan RV Chassis provides a comfortable customer experience, 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™ 15" glare-free digital dash display
  • Passive steer tag axle
  • Headlamps with auto on/off feature
  • Rain Sensing Wipers
  • Tilt Tank Drain Assist
  • Heavy Haul trailer mode
  • 3-stage engine compression brake
  • 20,000 lb towing capacity
  • Tri-Pod Steering Wheel with leather finish, phone, and media controls
  • Heated steering wheel
  • Spartan RV Chassis Passive Keyless Start
  • Suspended adjustable pedals
  • Memory setting controls for mirrors, pedals & steering column for drivers one and two
  • Air disc brakes at all wheel positions
  • Available CURT Spectrum™ trailer brake control
  • 20-Year Transferable Warranty on Frame & Cross Members
  • 5-year/100,000-mile transferable warranty
  • 5-year/100,00-mile Cummins Engine warranty
  • 5-year/200,000-mile Allison Transmission warranty
  • K3 605 Chassis



Peak HP

605 hp @ 1,800 rpm


292 + 48”

Towing Capacity

20,000 lb



Safety Innovations

Spartan® RV Chassis Advanced Protection System™ (APS) – King Aire

  • Automatic Traction Control (ATC)
  • Adaptive Cruise Control (ACC)
  • Electronic Stability Control (ESC)
  • Collision Mitigation System (CMS)
  • Mobileye® visual & audible lane departure warning
  • Tire Pressure Monitoring System (TPMS)
  • Spartan RV Chassis Safe Haul® (The industry’s premier factory-chassis integrated air supply for tow vehicle brake systems.)



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Operators Guides

Service Guides

Service Manuals

Wiring Manuals

Alternative Fuels


Ford Transit

RAM ProMaster