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They are describing ADDING roll bars not replacing the stock bars. Sumo springs do add to the roll stiffness and also add to the spring's stiffness where anti-roll bars do not. That said if your coach is loaded to near the max, then in big highway bumps, you will have the axles hit the factory bump stops giving a jarring ride, to say the least. Sumo springs or air springs will help, plus Sumos add considerable roll stiffness. Track bars keep the axles centered under the coach, reducing wandering and tail drag when towing. Each model of coach, chassis length and weight have unique handling characteristics. What works for someone else may not work to your satisfaction.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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