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 in is core to Spartan Motors. That’s why Newmar has partnered with us to raise the bar on safety on their coaches.

The Newmar King Aire is built exclusively on the Spartan 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 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.

Motorhomes riding on a Spartan chassis are built with care to stay on the road for a good long time.

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Premium Features

  • COMFORT DRIVE™ Steering Assist System w/Variable Driver’s Effort Control Feature
  • Memory Setting Controls for Driver 1 and 2 (Seat, Mirrors, Pedals and Steering Column)
  • SMART Steering Wheel with Leather
  • Passive Steer Tag Axle
  • Spartan Digital Instrument Panel
  • Side Mounted Service Center
  • Electronic Suspension Control System with Self-Leveling
  • Remote Air Compressor for Extended Auto Leveling
  • Cummins Connected Diagnostics™ System
  • 20-Year Frame & Cross Member Warranty
  • No deductible, 24/7 Roadside Assistance for first 3 years of ownership
  • K3 605 Chassis



Peak HP

605 hp @ 1,800 RPM



Towing Capacity

20,000 lb



Safety Innovations

Spartan Advanced Protection System

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

  • Collision Mitigation with Adaptive Cruise Control assists the driver of potentially dangerous driving scenarios and adjusts speed to maintain safety.
  • Electronic Stability Control automatically brakes individual coach wheels to help drivers maintain control during extreme steering maneuvers.
  • Lane Departure Warning (LDW) issues visual and auditory warnings to alert the driver if the motorhome drifts from its lane without a turn signal.
  • Spartan Safe Haul™ the industry’s only chassis integrated air braking system for tow vehicles to supply optimal braking performance.


Spartan Connected Coach