Class C rattles teeth when hitting bumps.

Same problem here. Tried new monroe rv shocks, firestone airbags (tried 40 and 60 psi so far), and new tires. It might be a little better but still slams hard on the bumps. I'm skeptical on the koni fsd's, for $200 a shock I'd want a money back guarantee that I am going to be thrilled with the improvement. The research I did, some were happy, some weren't that impressed. If the leaf springs are shot, I don't see how a shock is going to fix that. My class C is a 2008 Ford E450 with 22k miles, it's never overloaded and I wouldn't have thought the leaf springs would have completely fatigued yet but maybe they have.