Live out your dreams in ultimate luxury

Built utilizing unique construction techniques and offering numerous ride and handling upgrades, the Cornerstone is truly the quietest riding, best-handling coach on the market today—period. Premium interior features and materials take this powerful motorhome to the next level. The Cornerstone is the epitome of power meets luxury. The Cornerstone is built upon the Spartan K3 chassis. It features a Cummins 605HP engine, side-mounted radiator, custom-tuned Koni shocks and the Valid™ Truline air leveling system for a powerful and smooth ride you won't find anywhere else. Inside the cockpit, our cab-forward design features a 120-inch windshield, the largest in the industry, for an immersive view of the road.

With a heads-up design, the newly updated Safe View dash features a 15-inch digital dash, 15-inch center console infotainment center and tri-pod steering wheel to keep everything at your fingertips while keeping your eyes on the road and hands on the wheel. Heated and cooled Italian leather cockpit seats with massage function will keep you nice and comfortable. At the same time, safety features include a collision mitigation system with blind-spot monitoring and the Delta Mobile Systems® aiDARS™ 1X active 360° surround view system. All these amenities allow the Cornerstone to deliver the best driving experience in the industry.

2025 Cornerstone - 2025 Cornerstone
6
NO. OF FLOORPLANS
44' 11"
Exterior Length
6
SLEEPS UP TO

2025 Cornerstone Floorplans

2025 Cornerstone - 45B

45B

2025 Cornerstone | 45B

45B

2025 Cornerstone | 45B

2025 Cornerstone - 45D

45D

2025 Cornerstone | 45D

45D

2025 Cornerstone | 45D

2025 Cornerstone - 45R

45R

2025 Cornerstone | 45R

45R

2025 Cornerstone | 45R

2025 Cornerstone - 45V

45V (NEW)

2025 Cornerstone | 45V | NEW

45V (NEW)

2025 Cornerstone | 45V | NEW

2025 Cornerstone - 45W

45W

2025 Cornerstone | 45W

45W

2025 Cornerstone | 45W

2025 Cornerstone - 45Z

45Z

2025 Cornerstone | 45Z

45Z

2025 Cornerstone | 45Z

FLOORPLANS

Exterior Graphics

2025 Cornerstone - Agate Grey

Agate Grey

2025 Cornerstone | Agate Grey

Agate Grey

2025 Cornerstone | Agate Grey

2025 Cornerstone - Black Diamond

Black Diamond

2025 Cornerstone | Black Diamond

Black Diamond

2025 Cornerstone | Black Diamond

2025 Cornerstone - Black Pearl

Black Pearl

2025 Cornerstone | Black Pearl

Black Pearl

2025 Cornerstone | Black Pearl

2025 Cornerstone - Carmine Red

Carmine Red

2025 Cornerstone | Carmine Red

Carmine Red

2025 Cornerstone | Carmine Red

2025 Cornerstone - Coral Reef

Coral Reef

2025 Cornerstone | Coral Reef

Coral Reef

2025 Cornerstone | Coral Reef

2025 Cornerstone - Patriot Blue

Patriot Blue

2025 Cornerstone | Patriot Blue

Patriot Blue

2025 Cornerstone | Patriot Blue

2025 Cornerstone - Red Horizon

Red Horizon

2025 Cornerstone | Red Horizon

Red Horizon

2025 Cornerstone | Red Horizon

2025 Cornerstone - Silky Blue

Silky Blue

2025 Cornerstone | Silky Blue

Silky Blue

2025 Cornerstone | Silky Blue

2025 Cornerstone - Golden Sand

Golden Sand

2025 Cornerstone | Golden Sand

Golden Sand

2025 Cornerstone | Golden Sand

EXTERIOR GRAPHICS

STANDARDS & OPTIONS

Chassis
Spartan® K3 raised-rail chassis
Engine
Cummins® 15 liter X15 turbocharged 605 HP engine with 1,950 lb. ft. torque at 1,150 RPM
Transmission
Allison® 4,000 MH 6-speed transmission
Radiator
Side-mounted, parallel-airflow radiator
Alternator
210 amp alternator
Engine Block Heater
1,500W engine block heater
Engine Brake
Three-stage engine brake
Front Axle
Meritor® front axle with independent front suspension, integrated anti-sway bar and custom-tuned Koni® shocks- 20,000 lb. rating
Rear Axle
Dana® rear axle - 20,000 lb. rating
Tag Axle
Reyco® Granning® passive-steer tag axle with onee-touch manual air dump - 14,000 lb. rating
Braking System
All-wheel ABS disc brakes
Rear Axle Ratio
4.30 rear axle ratio
Tires
Michelin® 365/70R 22.5 in. tires (front) and 315/80R 22.5 in. tires (rear)
Tire Pressure Monitoring
Tire pressure monitoring system (TPMS) with temperature monitoring
Traction Control
Automatic traction control
Leveling System
Equalizer™ hydraulic automatic coach leveling
Air Leveling
Valid™ Truline air leveling system with auxiliary air compressor
Air Connection
Remote air connection
Chassis Battery
(2) 12V chassis batteries
Fuel Tank
175 gal. fuel tank with dual fills
DEF Tank
15 gal. DEF tank with dual fills
Tow Air Brake System
Spartan® Safehaul tow vehicle air brake system
Hitch
20,000 lb. hitch with 7-pin plug

Product Videos

2025 Cornerstone Luxury Diesel Walkthrough

2025 Cornerstone Luxury Diesel Walkthrough

Flagship diesel pusher featuring unique construction techniques, ride and handling upgrades, and premium interior materials. Recognized as the #1 selling coach in the 605HP engine category and described as the quietest riding, best-handling coach on the market.

ALL-NEW Blackout Package - Entegra Coach

ALL-NEW Blackout Package - Entegra Coach

Introduction of the new Blackout Package featuring black wheels, trim, lights, mirrors and badging, available on Cornerstone, Anthem, Aspire, Accolade XL, Accolade and Esteem models.

2025 Cornerstone Delivery Checklist

2025 Cornerstone Delivery Checklist

Comprehensive delivery checklist presentation for the Cornerstone diesel pusher ensuring new owners understand all features and operations.

Décor Options

2025 Cornerstone - Bianco
2025 Cornerstone - Prosecco
2025 Cornerstone - Latte

Bianco

1/3

Wood Options

2025 Cornerstone - Stonewall Matte Grey Maple
2025 Cornerstone - Almond Glazed Maple
2025 Cornerstone - Dove White Maple
2025 Cornerstone - Auburn Glazed Cherry

Stonewall Matte Grey Maple

1/4
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