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...
I see now that I missed the SSF-204-54s. They are rated 2500lbs. We'll watch the tires for sure.
I wonder, since I installed the rears as well, that the height rise I got (which isn't much) may offset the bouncing that causes the cupping. Will have to see.