[CaptnJohn]

I run my trailer tires at 110 psi as they will time out before any excess ware. Never find cabinets open or items out of place. Inflation to 16160, scale hitched to truck 13,660. Truck tires always 70 - 65 on the dually.Hitched truck weight is 12,240. On some bridges all gets bouncy but never over 65 mph may help. Solo the 200# hitch stays in along with the aux tank full, another 500#. Rides as good or better than my srw 350.
Class A -- I have the T shirt. A gasser will be no different. A DP with air ride will be better but a different bounce -- there are passenger seatbelts for a reason. In addition to a toad you will need close to $500K, don't forget the tag axel. Figure $4-5k annual maintenance, some years less some more.
There is at least 1 company that has RV shock absorber kits.
Although I swear at some roads my ride seems far better than OPs. Payload of 5598 appreciates a 3k plus pin.