Unfortunately, the rear 5100 shocks are only capable of handling 1" of lift over stock and most add-a-leafs add 1.5" to 2" of lift. While an add-a-leaf would absolutely help manage your truck's bed weight, you would need a shock capable of handling 1.5" or rear lift. The rear shocks in Eibach's very similar Pro-Truck system can handle 1.5" of lift.