I'm runnin the JKS on mine with 3" and so far, I don't really have any complaints. However, it started popping on me bad the other day. Crawled under there and saw that it was the trac bar at the frame end. It was pretty dern tight, but I still made extra sure that it was as tight as I could freakin get it.
Also shot some grease in that end (it's got a rebuildable, greasable johnny joint on it). However today, after some EXTREMELY MILD offroad use, it's now popping again.....i'm going to mess with it later.....might end up rebuilding the johnny joint.
Other than that, I can't complain about it.