I'm running buggy leaf set up. The best I can measure in the shop by jacking it up and letting the suspension drop, it looks like I need at least 8" of extension. So I'm pretty sure it will be even more once it's finished. It's a pile of crap but it's mine. I still have alot of work to do to finish it but I'm almost ready to build the d-shafts. Here are a few pictures I have done quite a bit of work since these pictures.
Yah I know it's ugly, but it matches me.