My 02 350 is sagging a bit. The leafs are weak and I am looking to change my leafs so it stands back up strong. I thought about just adding a leaf but all I read about is if you just add one over a year it will sag right to where the others are. Any brands that might last longer than others? Not trying to do a lift just get back to the original stance of truck with strength. If it lifts a bit higher that is fine gotta keep it good to plow. Thanks for any ideas