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...
Make sure the sway bar bushings have not deteriorated, especially on the rear...the F-53 chassis will crush them out....use an after market Poly bushing. The original rubber bushings are no good.