I am trying to find a set of Add-A-Leafs for a 1999 Chevrolet Silverado 1500. 4WD. Does anyone know a website or somewhere that I could find these things? Also, anyone with experience know if this is worth it? I currently have a Maxi-Dump insert in the back of this 1/2 ton truck. It does a beautiful job, but you can tell when there is some weight on the back end. I am looking to add alittle strength back there, and maybe even take some of the squatting out.