I just spent the past two hours reading ALL 60 pages in this thread and I am still nowhere nearer to making a decision.
I am not partial to keeping or removing the 1" front spacer. I want the best, most controlled ride possible.
My opinions are this:
COA #1: Keep 1" front spacer and install 5100's at stock height setting
COA #2: Remove 1" front spacer and install 5100's at third height setting
A 1" spacer is really nothing to begin with so I shouldn't have any issues. However, the higher the 5100 height setting, it appears the firmer the ride is - this is why I am partial to COA #1. However, with the 5100's being slightly longer than stock shocks, there might be suspension geometry issues adding them to my 1" spacer (albeit the issue seems minimal).
I am installing these shocks because my stock ride sucks and I have the most uncontrollable 'porpoising' while towing.
Final suggestion?