ohh, thats right. I know that axle.
Here is a quick look into the product development meeting behind that axle....
Boss: Whats the weakest part of the axle for rockcrawlers
Person 1: umm, the u-joint?
Boss: Hmm, ok. What's stronger than a u-joint?
Pause
Pause
Pause
long silence
Boss' 6 year old son: umm, 2 ujoints?
Boss: Ya! Duh, why didn't I think of that myself. It's so simple!
Person 1: Um, I'm not sure that is the right answer.
Boss: Well, I think it is. It was right under our noses all along.
Person: I'm still not so sure.
Boss: Well, this is what we're going to do, we'll build an axle with 3 ujoints per side! It will be 3 times stronger than a traditional axle. Now, that's an axle I can market!