The two times I have seen him break CVs was on just dirt hill climbs. Pedal to the metal bouncing up hill climbs is what did it both times. The driver side axle broke both times. He bent a few steering components as well, but I was not there when he did those. I figure this is not nearly as hard on components as rock crawling, since he was on worn down 30s with no grip and on loose sandy soil. But what do i know, I am just a dumb kid. He has since sold the truck and bought a tacoma to beat on. I have not seen him in a few months.
That'll do it!
when the tires have no resistance, they'll accelerate, and then when they come down (even on soft, sandy soil) something has to give. the sudden slowing of momentum on the tires will kill the axle shafts. Go bouncing around on rocks, does the same thing, just more likely. Thats why the "smart" wheelers take their time, and go slow, using their brains and their gears, not the skinny pedal