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...
Check your sway bar brackets and bolts and the bushing mounts. They have a habit of coming from the factory loose. I had one bracket break and couple of bolts loose at 6000 miles. Ford warranted it.