I have an old school setup. Detroit True-Trac up front and a Detroit Softlocker out back. I like teh True-Trac up front since it's not going to beat up my D30 as much. It biases no more then 2.5:1 and that can be controlled with some brakes. They're very quiet and seamless with disconnects. If you have a TJ with no disconnects, you'll feel the LSD on road. The Jeep will want to understeer up front. Some people say they can't feel it but they must be smoking crack or something. It's noticeable.
In the back, it would be less noticeable.
Although if the trail requires lockers, get lockers. LSD's are good but not that good.