Just installed Sumo Springs on the front of our 2015 E450 Class C Thor Chateau 31W. It seems to done what I was hoping for, although it did raise it by about an inch and a half, our coach also has Hel...
Jim, We have the -54's. They made a significant impact on "porpoising"... those along with a full set of Bilstiens really firmed the ride up and reduced roll as well. I put the stock bump stops back in and the ride is much smoother but at the expense of a tad more porpoising. I suspect we'll order a set of the -47's as a compromise.