What's your reason for wanting a locker? Do you do serious off-roading? If so, do you have full skids, a beefy rear diff cover, rock sliders, aggressive tires, front/rear recovery points, and a lift? That locker will get you into trouble in the bush if you are not properly equipped otherwise. I'd focus on the other stuff first if off road capability is your goal.

What are you driving? I saw in your sig your KJ was totaled.

For a DD avoid a lunchbox locer like an Aussie or a tru-trac. I have an Aussie in my YJ with the Ford 8.8 rearend and although it gives great traction, the road manners are not to good, especially in snow and ice.

A LSD is not much of an offload option if you plan on doing anything more then mild dirt roads.

Your best option in my opinion is a selectable locker like an ARB, OX, etc.... The biggest drawback to these style lockers is that they require the gears to be setup which requires special tool and some knowledge of setting them up. I suggest finding a local shop that can set up gears and ask them what they recommend for a selectable locker. On the trails I see a lot of ARB, but they require an air source.

I don't know if anyone makes a lunchbox locker for the weird D30 in the liberty, but a lunchbox locker in the front is fine for a DD since it only works when power is applied in 4wd.

So, a Tru Trac is good up front but not out back?

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A tru trac probably the best limited slip made. It has a unique gear design. I don't know what design but if you have the brake lock diff like a kk has, the DTT should be a good fit. From what I've been able to find out, they work very well. I've decided to put one in each axel when I have my gears done. Since I tow a camper, I was advised against my first choice of a DTT front and a Detroit locker rear. The eaton e locker is also a good choice. If you're planning on anything other than a DTT in the front then a selectable locker should be used.