I've wheeled from coast to coast from the highest altitudes of CO to the deserts of UT and the door-handle deep swamps of FL and I never installed a locker.
The biggest problem with wheeling a KJ is ground clearance. When I got stuck, 9x's out of 10 it was because I got hi-centered or sank down to the frame. I couldn't justify the expense of a locker that would've helped me that one time. Not that I'm against lockers, it just didn't make sense for me.
You'd probably get more responses if this was posted in the 4x4 section since this isn't really CRD specific.
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2006 CRD
http://www.UtahPowderCoatings.com/ http://www.gorecon.com/ I'm kind of a big deal.
RL rear bumper, ARB front bumper, Mile Marker winch, Power Tank, Skids by Mopar & Skid Row, RL Super Skink Sliders, 235/85R16 MTR, Air Flow Snorkel, DTT, 4.10 gears, Frankenlift II, Katskin leather, JL Audio stereo, Rosen video.