the performance trend link you posted is pretty sweet. program is pricey though lol
I think the way the picture is would be alright if your bagging over the axle or if your just on coils. You do want some sort of instant center. For me depending on how much lift and how long the link bars are I usually design the 4link to have the pinon housing follow the drive line.
For every program there is a hack, there for it could be free if you know the right people.
I don't know the right people so there for i don't have the program. lol
wow great post helps me out alot