My 2004 Dolphin W-22 has Sumos and isn't bad at all. Only difference is that I have Bilstein shocks on mine.
What air pressure do you run? I start out in the morning at 85 psi front and 90 rear. I have Toyo tires in front now, which seem to ride a little softer than the Sumitomos they replaced. i do notice the ride gets a little harsher as the tires heat up and the pressures rise. On hot days I'll end up at 96-98 psi front and 100-102 rear according to my TPMS.
I think large potholes or expansion joints are going to cause a suspension crash no matter what, but my W-22 rides much better than my last P-30 motorhome. The Sumo Springs do really seem to help in that regard.
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2004 National Dolphin LX 6320, W-22, 8.1, Allison 1000, Front/rear "Trac" Bars & Anti-sway Bars, Sumo Springs, Roadmaster Reflex Steering Stabilizer, 2005 PT Cruiser Toad
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