It's my understanding that all the replacement rear leaf packs cause you to lose capacity while improving the unladen ride tremendously. The mini-paks from Lorenz and Carli should leave your capacity intact. My Kore mini-paks definitely weakened my capacity on my '99. They've probably beefed them up by now. Contact the manufacturer's directly.My truck doubles as a DD and my work/business truck (please see sig 98.5...). The rear leaf springs are losing their arch from carrying around bricks,and stones etc. I cannot get a clear answer from anyone, as to how the Kore, Carli, Lorenz type sytems will affect both load carrying and towing capacities. I can't load my truck and have the headlights pointing to the moon. Can anybody give me a straight answer on this? Was thinking the Lorenz 5100 system. Not really interested in the lift, but if I am going to spend the money... What would you do?