The shop at the place I work gets a lot of newer motor homes for suspension issues. Anti-sway bars and after market airbags seem to be he preferred solution.
When I was running the gasser at max sidewall pressure on the tires, and my current DP at max sidewall pressure, it was like the Flintstone-mobile. Every bridge expansion joint jolted the coach. Load up for a trip and get the rig weighed. After weighing, we were 2000 lbs under gross and I dropped the tire pressure from 125 to 95. Big improvement in ride. Consult the tire manufacturer's pressure chart for the proper cold pressure. Most people add 5 psi to that number for a safety margin. You can if it makes you feel good, but I'm sure that the tire company's lawyers have already thought of that.