Snake Oil. Never thought they would work. I was amazed. Bought for several projects and fitted to my 2006 Dodge 3500 as a guinea pig. Well, they're smooth as silk. BUT it's nothing compared to the fact that the one road I drive creates a harmonious ground road jump in all the trucks I drive and everyone else. LEAF SPRING. I saw a Ford F-350 Flex three inches. I've spent thousands on two other trucks over the past decade to stop him. Little help. Bumps, tires, pressure, restraints. THESE TIRES HAVE MAGICALLY REMOVED THE HOPPING. I still don't get it and have tried but they are amazing. Henderson Nevada215.