Boris, from the description of how your coach drives, I would hazard a guess that it has air suspension. If this is true, read on!
There are a couple of different things that affect the handling with this system, proper tire pressure being the easiest to check and correct...which also can make a lage difference. The next thing would be your shocks. high quality and properly designed (for air suspension vehicles) shock can make a whale of a difference.
Coming up through 50 years of RV ownership, from a 17' Fan travel trailer, through bus conversions (First a Flxible, then latest an Eagle Model 10) I have a pretty good feel about driving both air and torsion suspension, as well as springs on my current Sunseeker. A basic difference in the two predominant types of suspension when on the road, is that air suspension tends to roll side to side, and torsion suspension tends more toward a fore and aft movement, somewhat similar to springs.
Having driven numerous different buses, I've had a "taste" of both systems, and my own preferance goes to the torsion suspension, although both are adequate for the job, and safe enough to be sure, but do require different driving skills. You shouldn't have to saw the steering wheel back and fourth all of the time to maintain a straight line.
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