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 wouldn't worry about it. It's not so much "lifting" it, as much as it is restoring lost ride height from the added coach weight. But...on radius arm suspensions, adding front ride height case reduce caster, so an alignment is a good idea.