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Old 11-30-2021, 02:39 PM   #1
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Mountain Aire Comfort Drive or Cornerstone 600HP

Could use some insights from the forum... My wife and I are evaluating Class A's. When looking at the Newmar Mountain Aire and the Entegra Cornerstone (since their price range is similar) would appreciate feedback on the Comfort Drive in the 500HP Mountain Aire vs the 600HP Cummins in the Entegra Cornerstone. Is the comfort drive feature more valuable than the 600HP Cummins in the Cornerstone? Thanks!
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Old 11-30-2021, 02:53 PM   #2
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We have 2019 Mountain Aire 4018 on Spartan K3 chassis and 500hp Cummins engine with 1700 ft.lbs torque.

Comfort drive is a wonderful innovation by TRW that greatly assists driving a big rig. It is very much the real deal with various rv builders now using under different names.

Comfort drive doesn't have anything correlation to engine size or weight. It is strictly designed to assist steering regardless of size of coach and/or engine.
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Old 11-30-2021, 02:59 PM   #3
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If you're wondering if Comfort Drive is worth the extra cost, the answer is emphatically YES.

If someone tells you different then:
A) they've never driven a coach with CD
B) they couldn't afford a coach with CD
C) they're simply a moron
D) All of the above
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Old 11-30-2021, 03:03 PM   #4
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If you're comparing new units, Entegra's now offer the same steering system as Newmar. Since the patent ran out, other vendors can now offer it. I thing Entegra calls it Easy steer.

Like mentioned above, this has nothing to do with engine horsepower.
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Old 11-30-2021, 06:45 PM   #5
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Regardless of steering systems, a Mountain Aire vs a Cornerstone is a no brainer for my....Mountain Aire.
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Old 11-30-2021, 11:23 PM   #6
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Are both of these Cummins ISX motors. New or what years.
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Old 12-01-2021, 05:25 AM   #7
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Looked at both Newmar and Entegra at Hershey. Was far more impressed with Entegra. We prefer the rigs a step down from the Cornerstone as there is no step up to the bathroom, hence more headroom and no midnight tripping. Test drove an Entegra and was impressed with the lack of rattles and squeaks. The drive assist was there, but the test drive had no semis passing at highway speeds or high winds. The rig was a joy to drive May buy one like it in 5 years when the price is better.
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Old 12-01-2021, 05:57 AM   #8
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Are both of these Cummins ISX motors. New or what years.
We are looking at the 2016-2017 model years (those model years pretty much max out our budget). Both are Cummins Cornerstone has the 600HP and Mountain Aire has the 500HP. In those years only the Newmar line had Comfort Drive so I am interested to get input from the forum on which is the better trade-off given my budget constraints - 1. Go for Comfort Drive with Less HP and Torque (Mountain Aire) or 2. Get a coach with the higher HP and Torque that does NOT have Comfort Drive (Cornerstone). Thank you to everyone for sharing any insights as we evaluate this large $ decision.
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Old 12-01-2021, 06:37 AM   #9
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Originally Posted by TwoBirdDogs View Post
We are looking at the 2016-2017 model years (those model years pretty much max out our budget). Both are Cummins Cornerstone has the 600HP and Mountain Aire has the 500HP. In those years only the Newmar line had Comfort Drive so I am interested to get input from the forum on which is the better trade-off given my budget constraints - 1. Go for Comfort Drive with Less HP and Torque (Mountain Aire) or 2. Get a coach with the higher HP and Torque that does NOT have Comfort Drive (Cornerstone). Thank you to everyone for sharing any insights as we evaluate this large $ decision.

Well some model years the ISX has a nasty issue with dropping the valve in number six cylinder, another IRV2 member, Mr_D, can probably chime in here with experience about that.

I believe the Mountain Aire has the ISM engine? If so, I have heard it’s a very robust engine.

What are the other features different between coaches?

Generator sizes? Battery bank size and condition?
Tire condition and age (original or newer tires?)
Does Newmar have emergency exit door in rear bath?
Do both have glass dash displays?
Floor plan and color scheme?

I would give more weight to features, floor plan, etc than
engine size, as both engines are very adequate.

Check the furniture to see if it’s “real” ultra leather. One or the other might have had the “bad” furniture already replaced under warranty. Each piece of furniture has a tag listing the covering type (usually in a coded number)
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Old 12-01-2021, 06:54 AM   #10
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which is the better trade-off given my budget constraints - 1. Go for Comfort Drive with Less HP and Torque (Mountain Aire) or 2. Get a coach with the higher HP and Torque that does NOT have Comfort Drive (Cornerstone).
HP & Torque are over rated, IMHO. I can travel the Rocky Mountains all day with 600HP & 1850 Torque and will still be checking into the camp when you arrive with lesser power. My 53,000 Lbs will go up the mountain perhaps 15 MPH faster and go down the mountain at the same speed as the lower HP. At the end of the day I would pick the coach that drives nice and is extremely comfortable. It's all about the amenities, the stuff behind doors & compartments you can't see; 600 series AquaHot (two 2000 watt elements), generator auto start, 150+ fuel capacity, solar, lots of battery capacity, etc., etc.
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Old 12-01-2021, 07:04 AM   #11
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I've read the ISX650 was most prone to the valve issue, less prone the 600, then the 550 seemed immune ,but I believe an owner recently posted here the loss of valve in 550. I'm not that up on what motor is in what coach per years, especially newer ones. But that's why I asked/concerned.
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Old 12-01-2021, 10:07 AM   #12
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HP & Torque are over rated, IMHO. I can travel the Rocky Mountains all day with 600HP & 1850 Torque and will still be checking into the camp when you arrive with lesser power. My 53,000 Lbs will go up the mountain perhaps 15 MPH faster and go down the mountain at the same speed as the lower HP. At the end of the day I would pick the coach that drives nice and is extremely comfortable. It's all about the amenities, the stuff behind doors & compartments you can't see; 600 series AquaHot (two 2000 watt elements), generator auto start, 150+ fuel capacity, solar, lots of battery capacity, etc., etc.
Thank you Hypoxia... features and comfort first is the way we are leaning. It is good to hear from someone that has the higher HP and Torque... if we make the mover to a coach we will be shifting over from a 42 foot Vilano 5th wheel and a 2021 GMC DMax Dually where HP and Torque have been keys to the performance and stability of our travel days. We are new to the characteristics of motorhomes so the insights from the forum are super helpful. Thanks again!
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Old 12-02-2021, 01:13 PM   #13
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When I drive the mountains I'd really love more HP and torque. That would remove the stress I encounter with my 325 HP Cummins in those situations. Moderate hills that I can get a running start on are ok but long 6%+ grades are no fun. I see the motorhomes with 600+HP and they are peppy and much stronger than mine. Maybe someday....
To compare, I'm 29k lbs loaded and the 325 should be a good fit. I'm half the weight (or less) than the newer motorhomes.
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Old 12-02-2021, 01:35 PM   #14
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A 500hp coach will take you everywhere a 600hp one will. My 450hp Bus takes me everywhere my Son's 605hp Newell does. When he had a 500hp Mountain Aire, I could slowly pull away from him going up a long grade west of Denver. I weighed in at 51,000# with a enclosed trailer and he was 5,000# heavier with his setup. Would I like 600hp? Sure I would, but 700 or 800 would be even better. If I were looking for a different coach, I would choose the one that had the best floor plan for our needs and handled the best on a level road. Our time spent climbing a mountain is so small compared to all other conditions, that it's a non issue. (we go over the mountains twice every year) When you're cruising down the road or parked at a campsite that extra 100hp is just something to talk about.
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