don't get to crazy with the torque wrench on the "U" bolts until after you take your truck to the scales. The springs are designed to support the front of the truck, with motor and all the rest up front. i would venture to say the rear of your truck will not weigh as much as the front with the engine and all the rest of the stuff up there. this being said, getting a good front to rear weight comparison will give you the data you need to reduce the # of leaves in the spring pack. this will soften the ride and may give you the ride quality you are looking for, and should help you new shocks work better.