I wouldn't want limited slip in front or back - in any 4WD. It can throw you sideways right off a road. Nice thing about a standard differential is - the wheel with the best traction is hugging the road (not spinning) and holding you there as sort of an anchor; it keeps you centered on the road.
Maybe road conditions are different by you. I've had several 4WDs with posis/limited slip and I hated them. Last one I had was a Chevy S series SUV. I live on a very steep, dirt road that never gets salted when icy/snowbound. Come up the hill when really bad - and it would be doing fine until the posi kicked in. If you kept rolling, it wasn't so bad. But, if you were trying to get rolling from a dead stop? Forget it. Posi would make it walk sideways instead of going up.
I'm never noticed much gain - traction wise from the Posi either. Back when I was a field mechanic for a Deere dealer - we had two service vehicles. Both International Scouts. Both 4WD, but one had all open differentials and one had custom-installed posis - front and back. In ice and snow - the one with the posis didn't do any better - and often, was just plain dangerous.
Now, if someone came out with a four wheel locking mechanism that you could control with an off and off switch - that'd be kind of neat. Deere has it in their log skidders. Differentials have hydraulic clutch packs.
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