User blog comment:Lukeatlook/Pyro's Item Overhaul 9 - The Carry Project/@comment-24486730-20141229160907/@comment-4813965-20141229172244

Take a look at Randuin's Omen in the Tank Project. It reduces damage from ranged basic attacks.

Besides, tanks will have not only armor, but also MR and the %AS slow from Warden's Mail. This is more intended as one of the ways to work around heavy armor stacking.