I have the same issue, but my fifth wheel axle is --\__#______#__/-- In this crude representation, the # is the leaf spring already on top of the axle. The spindles are above the level of the axle. Am I correct in thinking that I have to do one of the following: have blocks installed between the leaf spring and axle, have a sub frame built above the shackles or just get a straight axle where the spindles are inline with the axle?