We have the Gemini on the Sprinter chassis. There are times it feels like there is a little more side to side motion than I would like, but its pretty stable on the highway. I may look into the Koni shocks which have been well reviewed. I thought about Sumo Springs, but so far have done nothing to the suspension. Having just spent a ton of $$'s for things like a second AC and an auto hydraulic leveling system, I'm not ready to spend more just yet.
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