Do both the knuckle studs and 5th stud. That's you're biggest weak point. When some more $$$ comes along then do the hub studs.
You can keep checking your knuckle studs but they are probably original yota parts, 20 plus years old, been re-torqued 100 times, and sooner or later they are going to fail. And then hammers would be a crappy place to lose a steering arm.
I bought the ARP's and while it was torn down made the 5th "Stud" and I made it out of scrap pieces I had in the garage. With the ARP's and my 5th stud setup I have yet to break one, or have one loosen up.
But then again........I don't wheel all that hard.
