HAPPY NEW YEAR
I'd give it a good 6 turns like others said, but I wouldn maxx out especially if you have stock shocks..:nono:
every one has their own way of doing this. I have never cranked TB and jacked up a vehicle. Never had a problem. toyotas chevys etc. Plus that bolt is pretty hard, i doubt it will break.If you break the bolt and the key hits you in the head. The flat peice should stop it, but you never know. If not a hit to the head, maybe a finger off or something.This is why you should lift the truck off of the ground when cranking.
But your right you can do it on the ground. Just not a good idea.