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The H1 has Torsen differentials which are a little different than lockers, they apply a torque bias ratio bewteen the wheel that spins and the one that has traction. So a torque bias of 5:1 would send five times the torque to the wheel with traction. That's why if your hummer can't get traction they tell you to lightly press the brake to trick the torsen into sending power over to the wheel with friction. It's like a cross between a locker and an LSD.
Really confused

This is a quote from the Hummer's website:

Electronic locking/limited-slip rear differential Eaton's™ Electronic ELocker™ locks the rear output shafts forcing them to move in tandem. The result is outstanding traction in deep mud, in addition to enhanced capability climbing over large obstacles. Controlled by the touch of a button.

I thought this is a true locker because it said "locks the rear output shafts forcing them to move in tandem". It's also activated by a button. I think the torsen differential thing you are talking about is probably for the older H1s (back when it was just called Hummer, before the grocery version came out).

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You forgot the LR Discovery.........
Huh? The Discovery doesn't have triple lockers does it? It only has a rear one as far as I know. Not even the Defenders come standard with triple lockers. Although I seriously think they should. But how much do you want to bet that the next generation Discos are going to be built like the current RangRovers? (i.e. "electronic shit" everything?)