yea, you want it strong... but if you're using a 3" steel rod, 1st off, my rough math says that's going to weigh about 300lbs?!?! What kind of steering do you have? That's going to screw up weight distribution, all sorts of stuff isn't it? It'd be like driving around with a fat guy riding on your bumper all day.
Also, if it's THAT strong, and you hit something hard, instead of breaking a tie rod, you're going to break the tierod end... or worse, the knuckle, or stearing box... Seems to me, bending the tie-rod is the cheapest problem you could run into, and so I would keep that as the weakest link if I could.