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Leaf springs are intended to work as cohesive units of leafs. The combination of leafs are designed to provide lift and flexibility to the rear of the vehicle. Therefore, an empty truck that lacks lift at the rear is only liable to slouch when loaded, and helper springs or a leaf spring kit would soon buckle under the weight of the vehicle if installed into a framework of faulty leaf springs.
Indeed, helper springs or an add a leaf kit can make a pre-existing set of leaf springs stronger, as long as those OEM springs are in good shape at the time you make the enhancements. After all, helper springs and add a leaf lift kits aren't designed to function as primary springs. They're designed to function as enhancements to an optimal set of leaf springs that are already in place under the rear of a vehicle.
If an empty truck generally displays a lift at the rear, yet slouches in back when filled to capacity with heavy items, the leaf springs are likely to be in fine working condition. Alternately, if a truck only slouches when it's used to haul another vehicle, the issue isn't likely due to faulty leaf springs. Chances are, the pre-existing leaf springs simply need the added strength of helper springs or an add a leaf lift kit.
