Made you look

Just wondering how a lot of people seem to be running around with 38" and bigger tyres and basically stock yota and nissan diffs.
I am assuming they break a lot of the time, but they can afford to do this because spares are cheap (relatively).
Just asking as the jeep front axle - dana30 - is as strong as say a hilux front. I think, can't find my docs on the spline counts etc. so I am guesing.
Regardless, the trend in america is to go as big as possible with the axles.
We don't have that luxury here as the costs are insane and the industry is not built up to support it properly.
So I wanted to ask, what diffs people are running, what size tyres and how many breakages they are having. Spline count and diameter would help immensely.
cheers
z