What ron.dittmer posted above is right on the money!
We intentionally looked for and finally bought a smaller Class C (24 feet) that was built on a Ford chassis that the motorhome's weight did not actually require - the E450 chassis instead of the E350 chassis. This was based on the concept of "if you want something to be the most reliable and/or to last as long as possible - buy a heavy duty version of it but use it in a light duty way".
We intended on taking our small Class C off highway so wanted a rugged as possible chassis under it. The handling was great right from the start due to the E450's stock stiff springs, stock front steering stabilizer, stiff shocks, and stock front and rear sway bars. A few years after owning it I finally had the alignment checked by a commercial truck shop and they added shims in the front suspension (... probably to improve caster in accordance with it's loaded weight at the time).
The only ride/handling issue with it was - as ron.dittmer mentioned - a harsh ride in the rear (on sharp road anomalies such as cracks and potholes) -> but not too bad because we always tended to travel heavy in the rear due to staying on the top half of the large fuel tank and with a full as possible fresh water tank (ride in the front was fine). I felt that those stiff stock shocks in the rear were only adding to the harsh pounding in the rear from the springs.
To reduce the stock stiff shocks' contribution to the harsh ride in the rear we replaced the rear shocks with Koni's special Frequency Selective Damping (FSD) shocks. These shocks self-adjust so that they are soft on (high frequency) highway cracks and potholes, but are stiff on slower (low frequency) occuring motions such as on roadway curves and pushing from passing trucks. These shocks nicely improved the E450's harsh rear ride on our small Class C.
