I've wheeled hard with 10-bolts in the front & rear.
And I've changed tire sizes 3 times (33 35 & 40)
Unlocked with 35's, I never broke a shaft.
40's didn't work well with the 10-bolts. TOO BIG.
Locked rear up to 35" tires will hold good. After that, they start snapping way to often for what seems like no reason at all.
Locked front sucks, The ears on the front axle shafts for the wheel joints are way to thin to put up with any kind of binding.
SNAP - SNAP - SNAP - SNAP-
and I would bring extra shafts, front & rear and all the way around! And some gear oil, a drain pan, silicone, rags, brake cleaner,ect... MY .02