Originally Posted by tnjeep
most people (including me) feel like I need one when actually a 2wd with a good locker in the back would work 99.9% of the time.
This. I was out in Colorado with my parents this summer and my dad and I did basically the entire Alpine Loop in 2WD in his 2006 LJ 6-speed (no lift, but he runs 31x10.5 BFG A/T's). It was still fairly wet from snow melt (we went in late June). We did Cinnamon Pass from Lake City to Silverton and then Engineer Pass on the way back. The only time we needed 4WD wasn't due to a traction issue, but we needed 4-LO for the gearing to get up the very steep section near the summit.
I was absolutely amazed at the off road performance of his Jeep in 2WD.