The Tera shackles are a great tool, but they DONT offer any appreciable amount of lift in my experiance(Full size trucks). They allow more down travel, and some twisting motion on the leafs, for ALOT more articulation, than would be possible with standard leaf springs. I dotn see a problem with add-a-leafs, but it will most likely make your ride a little stiffer. If you are into rock crawling, I would recommend that set-up, especially if you have a SAS. If not, you should probably just go with the shackles(standard). That is just my experiance with them, and eachapplication MIGHT be different. I have never run them on my personnal vehicles, but I prefer prerunners as well.

Hope this helps..

Chase