On my coach, when it is lightly loaded (16,200 lbs), the Sumo springs make the small bumps more noticeable, but the coach sway is reduced somewhat. If the coach is maxed out (18,000 lbs), they really make a difference, as the coach now does not hit the bump stops with breaks in the pavement. Coach sway is reduced so that leaving a filling station with raised ramps is no longer a problem. Opinion: depends on what worries you. If you expect a smoother ride increasing the coach's spring rate (that is what they do) won't help. Just like the CHF the Sumo will reduce sway somewhat.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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