rgatijnet1 hit the nail on the head.
RVs have a much higher center of gravity, huge walls that are greatly affected by wind, and a softer suspension to keep the stuff inside safe/rattle free.
The only change we have made was the CHF to stop the excess sway from passing trucks. Slowing down also lessens the sway, but most are unwilling to do that.
As far as we are concerned, our bus drives extremely well considering its size, weight, and function. I mean, it is a house going down the road, not a two seater sports car. We have adjusted our driving accordingly.
Your $30K truck isn't a house on wheels. If it was, it probably wouldn't drive as well as it does. People just need to change their expectations.