Our Greyhawk was a 2009, which I think is a year or two before Jayco started using the term J-Ride in the Class Cs, but it had some of the components of J-Ride. We had the Hellwig Helper Springs and both front and rear anti-sway bars.
There are a lot of threads on here about poor Class C handling. Our Greyhawk handled great. I could hold the steering wheel just like I do in our cars, 2 or 3 fingers at the 7 o'clock position. No white knuckle driving in our Class C, even in 20 mph side winds (I would have 2 hands on the wheel then).
Did our Motorhome handle better because of the extra suspension components from the factory? I can't say, because I've never driven another Class C to compare it to. Ours had those extra components and handled very well. When the ball joints started to get some play after about 6 years, I noticed a difference. When they were replaced and the front end was aligned, the Motorhome handled like new again.
-Michael