Well if you put "Period" at the end of a sentence it ends the discussion. Period.
Since MM3846 was able to so convincingly end the argument, let's go with his comment of "dual LSDs". Truetrac is an LSD, and in fact the only one I can think of offhand that's available for these trucks. Yes I'm sure there are others.
I must clearly not know what I'm talking about with a Detroit. After all, I've only had one in two trucks, across the last 14 years or so. I've owned and driven them everywhere from the desert in California to wading in rivers over the hood, through mud and snow, etc. I've wheeled extensively with folks with ARB lockers, and seen how they're used, when they work well and when they don't. I actually had an ARB in the front of my Discovery but never got around to plumbing it in so it just operated as an open diff. Even though I didn't end my comment with "Period", I still stand by the fact that a Detroit locker has some advantages over an ARB, just as the opposite is true. For me, when the time came to choose, after seeing ARBs and Detroits on the trail, I went with Detroit, and I'm glad I did. That was in my Discovery, and when I bought my 110 it came with a Detroit in the back.
I've never driven LSDs in a Land Rover and I have no personal experience with Truetracs. If I was going to put traction differentials in another vehicle, for the kind of driving I do at this point I'd be tempted to put a Truetrac in front and rear.