[QUOTE=HansSchulz;1264880]May I ask a related question. We have a 2016 MBS 2401 Forester with a Hellwig sway bar installed. Yet, it dances way too much and seems to be bouncing off the suspension support with a loud bump on most uneven surface/curves. How can I upgrade to stabilize the vehicle and eliminate this noise?[/QUOTE
Please explain, are you saying that you are bottoming out the jounce bumpers on the rear axle when hitting bumps?
Go to the Mercedes Brenz Sprinter sub forum, the Forester sub forum, or the Sunseeker forum of the Motor Home section
Post your question there and be specific on what is happening. Unless you are severely overloaded and the jounce bumpers are almost touching the axle, they shouldn't be bottoming out. Are you sure you don't have something loose in one of the rear basement storage compartments that is bouncing and making a thumping noise when you go over a bump.
I know it can happen, because it happened to me. We have a 2017 BMS 2400WS and I had a milk crate with some one pound propane cylinders stored in the garage compartment right behind the drivers seat the first time out. Each time I would hit a bump, I would hear a thump. After about 15 miles worth of this thumping noise, I was able to stop to wee where the noise was coming from. Since everything looked fine, I started going through the compartments and recreating the sound. when I got to the compartment with with the milk crate, I lifted it up and let it drop. lo and behold there was my noise problem. A little repacking and the noise was gone.
I am not saying this is the problem, but rather that there is all kinds of information available on suspension enhancements for the Sprinter Chassis, along with knowledgeable forum members who frequent those three sub forums.