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2013 Entegra Cornerstone 45K Motorhome

An In-Depth Review of Entegra Coach’s Flagship Motorhome

Mark Quasius
Jul 1, 2012
Photographers: Mark Quasius
Entegra Coach is seen as one of the fairly new players in the Class-A market. But, in a way it has been around for quite a while.

Jayco’s owners, Wilbur and Derald Bontrager, formed Entegra Coach when they resurrected the remains of the former Travel Supreme Motorhome Company. Entegra Coach then improved upon an already well accepted product and backed it with a commitment to service and quality not yet seen in competitive products.

Entegra is growing substantially as potential motorhome buyers recognize its value and is now one of the major players in the higher-end, diesel-pusher Class-A market. Entegra’s flagship model is the Cornerstone, and RV Magazine was invited to do a review and road test on this outstanding motorhome.
Photo 2/17   |   The driver side slide-out was fitted with a very comfortable booth dinette and wrap-around sofa that makes into a bed for additional sleeping capacity.
Construction Overview

The Entegra Cornerstone is available in a number of floor plans, all of which are 45 feet in length and are built upon Spartan’s amazing K3 chassis. The Spartan K3 is the big boy of chassis used by many high-end, diesel-pusher manufacturers—but Entegra takes it a bit further and adds some additional tweaks to provide an even more stable, smoother, and quieter ride. Rough or uneven roads typically twist the frame and motorhome superstructure causing those squeaks and rattles that accumulate over time. Entegra adds both vertical and horizontal X bracing to the chassis frame rails to stiffen the frame so that the suspension will handle the bumps rather than allowing the frame or superstructure to twist.
Photo 3/17   |   2013 Entegra Cornerstone 45k Entegra Coach Motorhome Overview 2013 Entegra Cornerstone 45k Motorhome Exterior
Further improvements are made by installing a steel hoop, similar to a roll bar, at the front of the coach to minimize any flex in the windshield area and provide an additional level of safety in the cockpit area.

The Cornerstone features two methods of leveling the coach. A Hadley air leveling system will adjust the air-ride suspension bags to keep the coach level when parked. That’s a plus when parked on blacktop parking lots or in soft soil conditions where jacks could sink in or cause damage to the surface.
For those times when the surface is way out of level and the coach requires more leveling than the air bags can deliver, hydraulic leveling jacks are also included. These jacks are made by Equalizer Systems and are powered in both directions. Rather than use springs to retract them, the system utilizes two-way hydraulics to power them back into place. This results in a more positive retraction and faster return times.

All Entegra Coaches utilize a 2x4 wooden floor structure that is located over the top of the typical steel framed substructure. This helps to deaden any road noise, because the wood acts as a buffer to absorb and deaden any road noise or vibrations. It also provides additional room for insulation and gives every Entegra Coach an industry leading R-33 insulation value. An in-floor hydronic heating loop ensures that the ceramic floor tiles remain toasty warm on cool days or nights. Extensive insulation is also found in the front and rear caps, which is not the normal practice in the motorhome industry.
Photo 4/17   |   A 42-inch LCD TV is built into an entertainment center that contains the surround sound system components and any satellite receivers. An electric fireplace provides ambience as well as additional warmth.

The Cornerstone spares no expense when it comes to décor. Our test coach was painted in the luxurious Opulence Black Cherry paint scheme that featured a four-color design laid over a metallic-silver background. The Cornerstone receives five coats of urethane clear for a total of eight to nine thousandths of an inch of clear coat, giving it a very deep look to its finish.

In typical Entegra fashion, the powered mirrors are mounted low, beneath windshield to provide the best possible viewing angle while eliminating blind spots caused by higher mounted mirrors. The extra tall windshield and roll-off dash design also makes parking and maneuvering much easier due to the ability to see immediately in front of the coach. Large mono-blade windshield wipers are fitted to fully enclosed wiper arms that shield the windshield washer hoses from the sun’s devastating UV rays while powerful Xenon headlamps light the way for you during any night driving.
Photo 8/17   |   The Cornerstone has generous cargo storage in the basement. Powered cargo slide trays are included and a basement freezer/refrigerator provides additional food or beverage storage. A 32-inch LCD TV is fitted into an enclosure in the slide-out to enable game watching while you entertain.

The Cornerstone’s full house water filtration system ensures that clean water is available at every location. The 50-amp electrical service is fed by shore hook-ups or a 12,500-watt Onan Quiet Diesel generator, which is located on a slide out tray in the front cap. An Onan EC-30 Automatic Generator Start system can be energized to auto start the generator whenever shore power is not available and battery voltage is below a certain threshold or the thermostat is calling for air conditioning.

Eight AGM batteries are mounted on slide out trays for easy access and will supply plenty of 12-volt electrical power for quite some time. A pair of Magnum 2,800- and 2,000-watt Pure Sine Wave inverters provides AC power for many accessories whenever needed.
Photo 9/17   |   An AquaHot heating system provides zoned heat for the coach interior as well as the basement. It also provides heat for the heated floor and domestic hot water uses.
Photo 10/17   |   The water service bay has a power hose reel, a black tank flush connection, a second tank monitoring panel, an outside shower faucet, and electric dump valves.
The Aqua-Hot heating system will provide an unlimited supply of hot water, as well as handle the coach’s interior and basement heating needs. Air conditioning needs are met by three 15,000-Btu rooftop units with heat pumps. The units are ducted and feed a series of registers through-out the coach. The air conditioner return air in the main living area was fed through a mirrored and hardwood trimmed intake duct to provide quiet airflow when running. Indeed, it was one of the quietest coaches we‘ve been in and when all three air conditioners were running it was easy to hold a conversation in normal speaking tones.

Lighting throughout the coach was controlled by multiplex lighting controllers. You can create specific scenes to your own taste and save them to allow instant recall of any lighting scene from various locations within the coach. The powered sun and privacy shades were also controlled by these control panels. An optional iPad can be used to send wireless signals to this system to control lighting and shades from any location in the coach.

The Cornerstone’s interior is another area where things are kicked up a notch. While the norm in most coaches is Flex steel furniture with thin Ultra Leather material, the Cornerstone uses upscale Villa Natural Leather furniture. The woodwork is stellar to say the least. All of the Amish craftsmanship was evident in every piece of cabinetry or millwork, which was fit to perfection. From the polished ceramic tile floors to the vinyl padded ceiling, attention to detail was the order of the day.

The cockpit area is well laid out. A color monitor views the rear camera, as well as the two side-mounted cameras that auto sequence with the turn signals. A radio/CD/GPS navigation system is located directly above. The dash is finished with burl wood panels and the driver’s side console controls the usual array of switches for the engine brake, tag axle dump, auxiliary lighting, step well cover, and power sun visors.
The parking brake is mounted on the vertical dash to prevent pets from accidentally stepping on it and releasing the brakes. The Spartan gauges and information center are easy to view through the fully adjustable Smart Wheel. The integral seat belts are fed through slits in the six-way power seats, making it easy to buckle up. The Cornerstone also includes the TripTek trip computer system and a remote compass/temperature display.

Our coach was equipped with Washington Glazed Cherry cabinetry and one of three décor packages. The sofa-couch, love seat, and dinette booth were all equipped with large pull-out drawers to maximize interior storage space. The love seat on the passenger side can be replaced with an optional desk and recliner or dual recliners if desired.
Photo 14/17   |   The rear bath uses raised vessel sinks that are slightly recessed into the Corian vanity top to provide a more comfortable height while still retaining maximum counter space.
The guest bath is located mid-ship and features a vanity with recessed sink as well as a water closet in an enclosed room. Immediately opposite the hall is a cabinet with louvered doors that house the stackable washer-dryer. Trips to the campground laundry are a thing of the past with the Cornerstone.

The bedroom contains a king-sized air mattress and is separated from the rear bath and living areas by sliding pocket doors that utilize air operated locks, engaging whenever the parking brake is not applied to prevent doors from slamming around when driving.
Photo 15/17   |   The Cornerstone’s shower is made of hand laid ceramic tile and features a built in seat. The glass shower surround is circular and features sliding glass doors to prevent water dripping on the floor.
The rear bath is a slight step up from the bedroom. The attractive porcelain tiled shower area is surrounded by a circular glass shower enclosure with sliding circular doors that operate in tracks rather than swing out and drip on the floor.

Opposite the shower is a solid Granite vanity with dual sinks. An enclosed water closet next to the shower handles those necessary tasks. At the rear of the coach is a full-width aromatic cedar lined wardrobe with cavernous storage. The wardrobe doors also utilize the pneumatic lock cylinders to hold them in place when traveling.
Road Test

Once we were thoroughly acquainted with the Cornerstone and its features and controls it was time to hit the road. The 600hp Cummins ISX was a whole new experience and the Cornerstone quickly came up to speed. With 1,950 lb-ft of torque, losing speed when climbing a grade is a thing of the past. The disc brakes on all three axles easily hauled the coach to a stop.

Maneuverability was excellent. It seems like all Entegra coaches handle just a bit better than the typical coach. The addition of their X frame bracing and structural upgrades just allow the suspension to do its job that much better, while still offering the smooth ride one would expect from a coach of this caliber.

The chassis stiffening, plus the wooden floor sub-structure, absorbed any jolts from potholes or vibrations from the road. The suspension did all of the work and the coach body just rode along as smooth as can be. The noise from the road was dampened by the floor structure and high levels of insulation. Clean aerodynamics, especially noticed in the flush mounted windows, further reduced any noise at highway speeds. When you combine the handling with the quiet ride that we experienced the Cornerstone is truly the benchmark that will be hard to beat.
Photo 16/17   |   The dash includes features such as GPS navigation, color rear and side view cameras, outside compass/temperature display, and a TripTek trip computer system.
Photo 17/17   |   2013 Entegra Cornerstone 45k Entegra Coach Motorhome Overview 2013 Entegra Cornerstone 45k Floor Plans
At a Glance Price as Tested: $557,721 (MSRP)

Standard Features:
  • Three 15,000-Btu AC units with heat pumps
  • 23-cubic-foot residential refrigerator with ice and water dispenser
  • 40-inch midship LCD TV with entertainment center
  • 26-inch front overhead LCD TV
  • Six-way power cockpit seats with integral lap and shoulder belts
  • Two burner electric glass cooktop with convection microwave oven
  • Dual 2,800- and 2,000-watt pure sine wave inverters with eight AGM batteries
  • 32-inch bedroom LCD TV
  • Winegard in-motion satellite dome
  • In-dash GPS navigation system
  • Hadley air leveling system
  • Equalizer Systems dual acting leveling jacks
  • 32-inch exterior LCD TV in galley slide
  • Aqua-Hot hydronic heating system
  • Onan 12,500-watt diesel generator
  • Fisher-Paykel dishwasher drawer
  • Stackable washer/dryer
  • Built-in central vacuum cleaner with dust pan
  • King bed with Select Comfort mattress
  • Specifications: 2013 Entegra Cornerstone 45K

    Gross Vehicle Weight: 50,600 pounds
    Gross Combined Weight Rating: 65,600 pounds
    Wheelbase: 320 inches
    Overall Length: 45 feet 1 inch
    Overall Width: 101 inches
    Overall Height: 12 feet 11 inches
    Fresh Water: 100 gallons
    Gray Water: 60 gallons
    Black Water: 60 gallons
    Chassis: Spartan K3 rear engine diesel
    Suspension: Air ride
    Brakes: Full air disc
    Fuel Tank: 150 gallons
    Trailer Hitch Capacity: 15,000 pounds
    Engine: Cummins ISX with three-speed compression brake
    Horsepower: 600 hp at 2,100 rpm
    Torque: 1,950 lb-ft at 1,300 rpm
    Transmission: Allison 4000 six-speed automatic


    Entegra Coach
    (800) 945-4787


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