So, I was doing something completly unrelated to jeeps and something started nagging me about this wheel spacer thread.
If you do anything with the rear sway-bar links, make sure the bolt thread faces IN towards the springs and is NO LONGER than the nut, as in, doesn't protrude, or it can snag up in the spring Not sure if it applies to all kits with the stock tires (with some 6.25" of backspacing) but guys were tearing them because some of the jeeps were coming assembled with the threads out, so they put them back in that way and when flexed tore their tires. This seemed to happen more often a few years ago, I think the newer jeeps have the bolts the "right" way.
In the front, if you disconnect the sway bar and tie it up to the frame the tires may also be capable of reaching in far enough to snag the end of the bar at FULL FLEX and result in a tear. I never had that issue myself and flexed it until the fender clips popped, but thought I'd pass it along.
So in short, still don't NEED spacers in the rear, just make sure the bolt's the right way, and keep an eye on what you do in the front.
I was making a snack and it just totally hit me and I dove into a few forums until I found the old threads I was looking for. So there you go, good karma check, cookies check, bedtime!