Some reports are breaking on places like icy driveways. A front locker usually fixes the issue, but you've still got relatively weak CVs to deal with. Locker plus HD CVs seems to be pretty bulletproof.
Unfortunately the 100 is a big pita to change on the trail. The 5G 4R uses a bolt together assembly to attach the lower ball joint, so trail swaps are a breeze comparatively. But they're also pretty strong so breakage is rare. I started carrying two trail spares plus a rear drive shaft as my base kit. After 8 years I dropped to carrying only one and never broke one.
The 100 does have much better factory gas tank skid and rear axle - I've only seen one 8.2 break and that was aftermarket ring gear failure. But it's obviously smaller and weaker. Gas tank skid really is a weak point on the 4R. It's low and gets hammered on harder trails.
On my 3rd Gen 4Runner the axles would snap if you looked at them wrong.
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