A couple of questions on this... First, let me say that I have a front bumper, lift, CMC, Icon tubular ucas, 4.56 gears, etc... So, I am not that concerned with it fitting. I have had 305's and had no issues. With that being said, the 305's wheels had 5 backspacing and 0 offset. Do you think a 315/70r17 would rub the uca with 4.5 backspacing and -12 offset?
Second question... I have read why many people like a 285 or 315 over the other. Most of the time it comes down to not being able to fit the bigger one, or the narrow one is better in the snow, wider is better in the mud, the list goes on and on. So, if fitting the tire under your truck wasn't an issue, which would you pick and why? Why is one better than the other?