I have done both the Hellwig sway bars and the Sumo springs on a 2016 25B. Put both front and rear sway bars on at 5K miles. Really made difference when being passed by big trucks. I describe it as going from a shove to gentle push. Installed Sumo springs this summer at 38K miles before a trip to Vermont. With the Sumos when a truck passes there is still a push but more like a nudge. Where I notice the Sumos most is there is less side to side rocking when turning in and out of parking lots and other places at slow speeds. The wife says the ride is better when sitting back in the coach. When at the camp site you do not get as much bounce when moving in the coach. As for smoother ride over rough road, after driving thru WV and MD interstate construction, they didnt seem to help much.