Unless you're rock crawling, I can't see the need for locking differentials. The ARBs are nice, but they are more than double the cost of a good locker or limited slip differential. Everyone that I know of that has ARB air lockers installed has had leaks in them, later if not sooner.
For what it's worth, we have Auburn limited slip differentials in the front and rear of our Land Cruiser, and our full size truck was ordered with a factory limited slip differential in the rear. So on the truck, we really have a 3-wheel drive considering the stock 4WD IFS setup in the front. Are you hooked on your brand because there are a lot of options out there? We considered locking differentials, but we occasionally have ice and snow, and I don't like the way most lockers behave in turns and when on slippery surfaces. We couldn't be more happier with the LSDs.
If you do happen to get stuck, then use your winch. Actually, we bought winches for the vehicles before anything else which still makes a lot of sense.
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