Thoughts times 3:
Nothing wrong with owning a "C".
Now with many large vehicles the suspension benefits from an upgrade or two.
SWAY bars, Control side to side rocking \|/ like that Some RV's come with good ones,, Some not so good.
Track Bars ~~~~~~~~ Control what I call Wagging, you described it. Here is what happens.
The body moves side to side over the axles.. If the front moves right as the rear moves left.. it wags. (or the other way around) The track bar does not control this, it stops it DEAD in it's tracks. 100%
And finally, tire inflation.
There are people who read the side of the tire "75PSI" and blow it up to 75PSI.. Problem is that is not what it said.
It said Maximum load 5,000 pounds at maximum pressure of 75PSI.
(NOTE: Pressure and load picked at random, for demonstration purpose only and if they match any tire made I will be very, very, very, surprised).
Some read the sticker which says, for example 50PSI.
And some run the wheel over a scale and .... Inflate per Manufacturer's (Tire maker's) Recommendations based upon the load.. Some add 5 PSI.
These are the folks who value control.