We currently have a 25' Class C with the MB V-6 diesel engine. The unit tracks down the road very solidly. The only issue we have is lack of interior space. We started looking for an entry level Ford ...
Mine is an older F-53. No, it holds the road just fine. However, tire pressure and alignment play a big part in the handling of the rig. Also I have inflatable air bags on the rear axle. They help tremendously.
Having said that, I would insist on driving another similar model that maybe is aligned a bit better.