No offense to anyone, but I've been RVing since 1976 and never had a completely smooth riding RV. You have to keep in mind that driving a Class A or Class C you have a house mounted on a truck or bus frame and being a high profile vehicle your subject to wind and any bump on the road that you encounter is going to cause a rocking motion or a porpoising motion. There are expensive equipment that you can buy to limit these motions. And sometimes people forget that most roads are supered (angled for drainage) from the centerline to the shoulder. So your driving down the road at a slight angle. Good Luck in your attempt to get a smooth ride.