krewzlo
+1y
Mine is just barely street legal and I don't worry about that but do worry about narrow roads and oncoming traffic. Someone cutting a corner a little too much and not seeing the fenders out that far could ruin yur day real quick. Max face milling is 3/8 per wheel so doesnt save a ton but every bit helps. I wouldnt go any wider than you have to, every but wide also makes the fender that much longer and end up being a full bedside and also overlapping the taillight. Mine are real close to covering my tailights.
I wouldnt advise narrowing your arms, you get less lift, takes more psi to lift and the steering radius will be insufficient. We already get less turning ability and then take an inch or two out of the arms and you will have more problems than just a 20 point turn. I know it sounds cheaper and easier now but when you have to redo it, it costs even more. The pivot point of narrower arms and dually rotors is way different than longer arms and fleetside rotors, you will get more "swing" if that makes sense with the dually rotor as the wheel is so much further away from the ball joint/ pivot point than with the fleetside rotors. Sotck mine had horrible bumpsteer, now it is much better. Before when turning at slow speeds at full lock it would push the tire as much as it would turn it, now it is much better. Its kind of hard to explain in words without a visual to go with it so I hope I am not confusing you. There is alot of geometry to figure in than just narrowing or lenghtening arms. One of the best parts of running fleetside rotors are they are much cheaper to replace and is much easier on the wheel bearings. Its too bad gm, ford, or dodge can't figure this out and made them with longer arms and non dually hubs but that is the cheapest way to do it so thats what they do. Also 16" wheels wont fit on the fleetside rotors due to clearance on the inside back of the wheel. But that could be solved as well with different caliper design and a little bit smaller diameter rotor, or just put 17's on stock.
Hope I haven't confused you yet.