How long have you been in this coach?
Has it gotten worse?
Or are you just getting tired of it?
The OEM shocks ride pretty well, but don't last long, so
How many miles on the coach?
The advice to weigh it and adjust the tire pressures it spot on. Best place to start.
CAT Truck Scales and LocatorMichelin's Weight/Inflation Chart works for other tire brands, so long as you match the tire's specs including load range to the table. Note that Front and Rear are different AND that the Michelin table uses Corner Weights, not Axle Weights. So on most scales you have to double Michelin's numbers to match say a CAT scale weight since you can't get each corner onto their scales.
Hopefully you won't need full "sidewall" pressure of 80PSI per rear tire. That would mean the rear axle was at capacity. Compare GAWR REAR with twice the Michelin max and you'll see that.
Likewise, you should not have More Than 65PSI in the front tires. Why? Because the GAWR Front (label in driver's door jamb) is 5000LB and that's what the tires it should have come with work out to at 65PSI Single Application.
Best thing most of us can do for Ride and Tracking is to set Front Tire Pressure to what the Load calls for.
Personally, Mrs and I don't sweat the ride or the noise. Part of that, we don't drive luxury vehicles as daily drivers. Another part is that we pound around in boats a lot. Finally, as eloquently stated above (crude, boxy, rattly) we accept our coach for what it is. Like a person, it does many things well, and some not so well.