We have a Jayco 'C and have built the equivalent of a JRide, well JRide+, and it does handle great, like a big SUV. We go around curvy roads at +5-10 mph rated speed as the 'C corners pretty flat.
The 'C came with the rubber isolation mounts already, as well as the Helwig helper springs. We added the heavy duty anti-sway bars front and back, as well as Bilstein shocks all around, a trac bar, steering stabilizer, and all-steel cased commercial-grade tires. A top local alignment shop did the alignment.
We rented a variety of class-Cs for 10 years before we bought, in lengths from 24-32 feet, with and without slide-outs so we have a good idea of the handling differences.