IMHO the dana 30 is a great axle. I beat the ever living piss out of mine. Yes I have had a few failures.
However, it has NEVER left me stranded. (It is a mighty fine polished turd). But there have been occasions when I drove home on the front end after breaking driveshafts or rear end parts.
Now that I have the tow rig, my retardedness skills have advanced even more.
I'm really amazed it has lasted as long as it has.
Is the dana 30 the greatest axle ever?... probably.
Will a dana 60 shit parts with me wheeling on it... probably. Just a matter of time.
In summation; wheel it till it breaks repeatedly. Once it starts breaking every weekend, it's time to upgrade.