Frank, Thanks for the email update. I didn't see your email address on there so I will update here
In addition to not being real bright and climbing lionsback while two other vehicles were on it, the parties involved were likely drinking. Someone pointed out that the guy you see "guiding" the fated truck is holding a beer in his hand. The truck that rolled was trying to back up to get out of the way of the two coming down.
1) The black 4-runner had no business coming up until the others were down. I can just imagine what the guys on top were thinking..."what is this idiot doing?!?!"
2) You do not spot a vehicle that is backing up from the front, DUH! They dropped a rear wheel into a crack and rolled. If he would have been watching from behind instead of sucking down a brewskie this probably could have been avoided.
Darwinism is a good way to describe what happened. I hate to see people get hurt but, these guys brought it on themselves. Frank makes a very good point in that, the whole off-road community suffers from the stupid acts of the few. I hope anybody that off-roads takes notes on this incident. Be careful, use your head. Drinking and driving can be as dangerous on road as off. Dumb, dumb, dumb, dumb, dumb.