I know this topic has been covered many times. I purchased a 2016 Fleetwood bounder 35K this year with a 22,000lbs F53 suspension. These are very tall rigs and very top heavy. I performed the cheap...
You can do a search for my post from earlier this year. We have a 2013 Tiffin Open Road on the Ford F53 chassis. Due to my wife's cancer treatment, she could not deal with the body roll. Went to Henderson's Line-Up in Grants Pass, OR and spent $7,500 for a full suspension upgrade. It did the trick and the handling is superb.
They also weighed the coach and I dropped the tire pressure to 85 psi. which resulted in a less harsh ride.