There are several threads dealing with handling issues on this (MBS) forum as well as on the Solera forum. I think people have upgraded their coaches in three different ways - the Helwig anti-sway bar, the Sumo Springs (either bump stops or the higher end upgrades, on either the rear or both front and rear), and upgraded shocks. As a guess, if you went full in on all possible upgrades, and did the installations yourself, you'd probably spend somewhere in the $1000 - $1500 - $2000 range.
All of these things will improve your handling to a greater or lesser degree, but there are two fundamental problems which will limit how much improvement you see. First, you're driving a big sail down the road. It does pretty well until it's hit by cross winds or passing vehicles - then the sail part comes into play. And second, the Sprinter chassis is narrow such the "house" portion of the vehicle is quite a bit wider than the wheel track. And much of the weight of the coach is along those outside walls. Not a great design when stability is the goal.
Personally, I've upgraded to the Helwig sway bar and the lower end Sumo Springs on the rear axle. And I avoid driving in high winds if at all possible!
Dave
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2015 Solera 24R
2014 Mercedes Chassis
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