2021 Cornerstone


Take one step inside the Cornerstone, and you’ll see why this is the best-selling model in the Cummins X 605HP engine category. This powerful coach delivers the ultimate luxury experience. With unmatched style, the 2021 model offers top of the line interior features such as new high-class quartz countertops, upscale porcelain tile floors and true Villa Italian leather furniture throughout. Technology enhancements like the updated Xite® XSG3 radio system, power driver’s cockpit window and 43” exterior Samsung® Smart TV allow you to live the life of luxury.

Product Video


Ward = wardrobe

Lav = bathroom sink

Med = medicine cabinet

Ohc = overhead cabinets

Fridge = refrigerator

Micro = microwave

Exterior Graphics

Standards & Options


Chassis Spartan® K3 raised-rail chassis
Engine Cummins® 15 liter X15 turbocharged 605 HP engine 1,950 lb. ft. torque at 1,150 RPM
Transmission Allison® 4,000 MH 6-speed transmission
Radiator Side-mounted radiator
Alternator 210 amp alternator
Engine Block Heater 1,500 watt engine block heater
Engine Brake Three-stage engine brake
Air Leveling Valid air leveling system with auxiliary air compressor
Leveling System Equalizer hydraulic automatic coach leveling
Ride & Handling Package Electronic stability control
Front Axle Reyco® Granning®- 20,000 lb. rating
Front Suspension Independent front air suspension (IFS)
Rear Axle Dana® rear axle- 20,000 lb. rating
Tag Axle Reyco® Granning® passive steer tag axle with 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” tires (front) and 315/80R 22.5” tires (rear)
Tire Pressure Monitoring Tire pressure monitoring system (TPMS) with temperature monitoring
Traction Control Automatic traction control
Shocks Bilstein® shocks- 60mm front axle & 46mm rear/tag axles
Air Connection Remote air connection
Chassis Battery (2) 12V chassis batteries
Fuel Tank 150 gal. fuel tank(dual fill)
DEF Tank 15 gal. DEF tank (dual fill)
Turning Radius 55 degree turning radius
Tow Air Brake System Spartan® Safehaul tow vehicle air brake system
Hitch 20,000 lb. hitch with 7/4-pin plug


Roof 4" arched aluminum trusses filled with bat insulation and reflective Flexfoil® topped with 3/8" plywood decking then one-piece fiberglass
Walls 2-1/2" exterior walls with Aluma-Tru™ welded tubular aluminum studs on 16" centers or less filled with bat and Flexfoil insulation then covered with high-gloss gelcoat
Floor 2" x 4" wood trusses on 16" centers or less filled with bat and Flexfoil insulation then topped with 3/4" 7-ply plywood decking (R-33)
Frame X-Bridge™ bracing welded into chassis frame
Front Cap Insulated front and rear caps (R-24) with steel-reinforced front cap and windshield frame
Slideouts Entegra-exclusive Relia-Torque flush-mounted 12V slideout system with VegaTouch and rocker switch controls

Heat, AC, Water & Power

Heated Tanks Aqua-Hot® heated basement storage on thermostat
Generator Onan® 12,500 watt diesel generator, with automatic start, on powered slide-out tray
Inverter (2) 3,000 watt pure sine wave inverters
Batteries (4) L16 AGM batteries (6V/390 amp hrs. ea.)
Electrical Hookup 50 amp power cord on electric powered reel
Power Management Premium surge protector with smart transfer switch
Air Conditioning (3) 15,000 BTU A/C units with heat pumps and condensation drain system
Black Tank Management Sani-Con® Macerator holding tank dump system with electric gate valves and manual backup
Black Holding Tank Sprayer Black holding tank sprayer
Water Filtration City and tank water filtration system
Winterization Drain System Winterizing drain system
Water Monitoring Trutank™ ultrasonic tank monitoring system displayed on VegaTouch screen
Water Hose w/ Electric Reel Water hose with electric reel


Stainless Steel Accents Executive Bus Armor 10” stainless steel trim
Engine Door Power rear engine door with manual override
Patio Awnings Dual roof-mounted Girard® Vision dual pitched patio awnings with LED lights
Door Awning Girard® power entrance door awning with LED lights
Slideout Awnings Girard® Ultra slideout awnings
Window Awnings Girard® Ultra window awnings
Windows Frameless, dual-pane, tinted, safety-glass windows
Keypad Handle Lit grab handle with keypad system for keyless entry
Exterior Entertainment 43” Samsung® 4K UHD Slim, Smart TV wand Bose® Solo 5 sound bar on TV bracket with extend, tilt and swivel arm
Mirrors Chrome, heated, remote control, Ramco side-view mirrors with integrated cameras and blind-spot indicators
Exterior Diamond Shield™ front protective film mask
Headlights LED high/low beam headlights and fog lights 
Daytime Running Lights Daytime running lights
Accent Lights LED accent lights under passenger slideout rooms
LED Lights LED marker lights, turn lights, license plate light, accent lights, & docking lights
Clearance Accent LED lit chrome clearance accent light
Rear Mudflap Full-width rear mudflap, with chrome “Cornerstone” nameplate
Satellite Dish - US Winegard® TRAV'LER satellite dish DIRECTV®- standard with USA option
Satellite Dish - CA Winegard® TRAV'LER satellite dish Shaw TV- standard with CSA option
TV Antenna Winegard® Rayzar automatic powered TV antenna
WiFI Winegard® WIFI extender with 4G/LTE
Utility Center Heated exterior utility center with 5" LED Firefly® tank monitoring panel
Exterior Freezer 2.8 cu.ft. exterior Dometic® refrigerator/freezer on slideout tray
Cargo Features Power locking baggage doors, (2) power slideout basement storage trays
Paint Sikkens custom full body paint 
Third Brake Light LED third brake light
Entrance Door Removable screen on entry door


Cameras Xite™ 360° camera system that displays on digital dash screen
Dash Valid 15” digital dash with selector knob and three main selection screens
Infotainment System(s) Dual, glass panel 9” touchscreen in-dash infotainment center with Rand McNally™ RV navigation, Bluetooth, SiriusXM™, AM/FM tuner, integrated camera control, house mode whole coach audio distribution, and integrated VegaTouch coach control
Driving Features E-Z Steer™ electric, adjustable power steering assist with steering angle sensor
Steering Wheel VIP wood-grain, leather-wrapped, power tilt and telescoping steering wheel with integrated controls for radio, cruise, wipers and Bluetooth phone functionality
Sound System JBL® premium audio 11-speaker sound system with amplifier, speakers and DVC subwoofer
Windshield Ultra-Vision® one-piece wrap-around tinted windshield
Start Push button start system
Driver / Passenger Seats Villa® 6-way power, lumbar, heated and cooled Italian leather driver and passenger seats with integrated seatbelt
Additional Amenities Power operated toll window on driver's side, (2) dual USB ports and (2) 12V socket for charging
Power Features Powered flush stepwell cover
Pedals Power adjustable brake and accelerator pedals
Visors & Privacy Shade Powered front sun visors and privacy shade
Side Consoles Wrapped dash with molded side consoles


Television - Front Overhead Samsung® 32” LED Slim 1080P Smart TV in front overhead
Command Center 10” VegaTouch touchpad system for complete integration of coach controls (mobile app available)
Television - Living Room 50” Samsung® 4K UHD Smart TV
DVD Systems Sony® HD Blu-Ray® player
Sound - Living Room Bose® Soundbar 700 sound system with wireless surround sound speakers
Furniture Villa Italian leather furniture throughout
Flooring Hand-laid, high-gloss porcelain floor tiles
Lighting Premium, recessed, 12V, LED lighting
Ceiling Decorative ceiling feature with integrated accent lighting
Window Treatments Powered solar day and black out night shades
Central Vacuuming System Central vacuum system
Interior Doors Aire-Secure™ travel locks for all pocket doors
Electric Fireplace LED lit fireplace with 1500W heating element (45B, 45X, 45Y, 45Z)
Cabinetry Handcrafted hardwood cabinetry
Fascia Handcrafted hardwood fascia
Washer/Dryer Whirlpool® stacked washer and dryer


Refrigerator Whirlpool® stainless steel residential refrigerator with ice maker and water dispenser
Cooktop Induction cooktop with matching wood cover
Microwave Whirlpool® Gold 1.9 cu. ft. convection microwave oven
Dishwasher 24" stainless EZ clean Fisher and Paykel Dishwasher
Kitchen Backsplash Porcelain tile backsplash
Kitchen Countertops Quartz countertops with dimmable LED accent lighting
Sink Blanco single bowl granite sink
Vent Maxxair® power vent exhaust fan with intake
Waste Basket Large deep drawer for waste basket with easy access trash chute (trash chute not available in 45F)
Storage Slide out storage tray(s) in overhead cabinet


Bedroom Mattress / Bedding Select Comfort® Sleep Number® king-sized mattress
Television 32” Samsung® LED, HD Slim 1080P Smart TV
DVD Systems Sony® Blu-Ray® player
Sound Bose® Solo 5 sound bar
Ceiling Fan Ceiling fan
Nightstands Nightstands with USB ports and solid quartz tops
Bedroom Wardrobe Large cedar-lined wardrobe with motion activated LED light


Bathroom Countertop(s) Quartz countertops with dimmable LED accent lighting
Sink Integrated glass sink
Bathroom Shower Porcelain tile shower walls and floor with skylight and frameless glass shower door
Shower Seat Teakwood shower seat (not available in 45F)
Shower Head Pivoting shower head and separate hand-held spray wand
Water Saving System Aqua View Showermiser water saving system
Toilet SaniFlo macerator toilet in main bath (N/A on 45X, 45Y, 45Z)
Bathroom Ventilation Maxxair® Deluxe power exhaust vent fan with intake


Collision Mitigation Collision avoidance system with collision warning and adaptive cruise control
Blind Spot Monitoring Blind spot monitoring system displayed on digital dash screen
Carbon Monoxide Detector Carbon monoxide detector
Lights Porch light and motion sensor security lights
Security System Security system with glass shatter sensors
Smoke Alarm Smoke alarm
Security Safe Safe
Seat Belts Seat belts in every designated seating position


Canadian Standards Canadian Standards- CSA
Theater Seating Theater seating with power recliners and fixed console
Reclining Sofa 100" power reclining sofa
Fireplace/TV/entertainment center and work station ILO sofa Fireplace/TV/entertainment center and work station ILO sofa
Satellite Dish Winegard In-Motion satellite dome
Satellite Dish - US Winegard TRAV'LER Dish Network
Solar Dual 100 watt solar panels
Dinette Dinette booth
Freestanding Table Option 1 Freestanding table with 4 chairs

Décor Options

Entegra Coach peace of mind

2 years
3 years
5 years

2-year warranty and 3-year roadside assistance

At Entegra Coach, excellence doesn’t end with our stunning interiors and superior craftsmanship. We back each luxury coach with the industry’s highest level of service—including a 2-year warranty and 3-year roadside assistance.

2-year warranty details

3-year roadside assistance details


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