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Does your coach have a rear sway bar?  Mine does and I think it was added at Newell by the previous owner.

I do have the large air lines to the bag tanks and I feel as though the ride is very solid from a sway standpoint.

Is yours the hump roof?

Yes, mine has a rear and front sway bars. They are both the same size, around 2” on the rear and front.

Mine is not the hump roof.  I am not seeing that that additional height and the associated weight moment you mention would have any more than a very very small impact due to the roof line.  
At one point in time, one of my front shock absorber mounts broke at the weld.  I also did not notice any difference in ride.  When I mentioned that to Newell, they said I would not notice much as most of the ride is driven by the air bags and tanks being a part of the damping of the entire system. (as I recall).

Sorry I can't help more

Appreciate your input. I am not an engineer so I am not sure as to the affect the height has, but I suspect you are probably correct that the difference would be minimal but it is a difference none the less. At this point I am just running these things through my small mind and seeing if anyone else has any experiences to add to the discussion. 
I think at some point I will get under there and make the mods and see what if any effect it has. I may need to try to quantify this somehow. Maybe this is in my head, I may look into something that will track the movement of the coach and I can see how its actually moving or not.