Do you guys do this to compensate for body lift?
I did the 1" BL to assure clearance for 33's on a 2-1/2" OME lift.
Added the 1" MML to solve the fan shroud issue associated with the 1" BL and to provide added insurance to minimize d/l vibes. Added adjustable, rear UCA's at the same time for the same reason.
I was also hoping to delay the inevitable SYE for $$ reasons. In my case, I bent my transfer case output shaft on the maiden voyage after installing the lift, BL and MML & 33's and had to upgrade to the SYE immediately... EDIT: The SYE required a new drive shaft, too...$
Then too, the steering manners changed after the BL/MML were installed and in my case had to add a M.O.R.E. steering bracket to resolve that issue...
They say that modifications are often never as simple as they appear on Jeeps. It's been my experience that, who ever "they" are, "they're" right...
I did all the installations, with the exception of the SYE, myself, so it wasn't as expensive as it could have been.