This may not help you much as we don't own a motorhome.  However, we've driven a couple and I used to drive 18-wheelers.

The floating sensation is very likely the air ride suspension working for you.  When I drove 18-wheelers, we had air-ride seats and unless it was a really hard bump, one seldom felt them in the "seating sensor."

However, during your drive, did you experience the floating sensation in your hands while driving?  If that sensation seemed solid and you had no squirrely movements on turns and lane changes, then I would say you were good.

How did it feel meeting trucks and experiencing wind gusts?  But then, did you get to drive it very far?   When we were test driving two different units in our research, one test drive was about 80 to 90 miles round trip and the second was about 200 or so round trip.  That last one was with a 42' Tiffin Phaeton with a tag axle, and it felt a lot more solid than the earlier 40' Phaeton on the shorter drive.

Had we gone with a motorhome, I think we would have opted for the 42' unit with the tag axle.  Extra wheels on the ground add to the solid feel.

Terry

If you watch the big MHs coming and going in and out of parking lots, rv parks or dirt roads you see a lot of floating, rocking and rolling....

I've driven short and long MHs with spring suspension, air ride and combination of spring and air bags. They all have had the floating and rolling. I always thought it was due to weight and height of the MHs.