It's all speculation at this point as nobody has really fully compressed the suspension with 17x8.5 +00 and posted on the forum about the results. What I can tell you, just like a few pages back is that the GEN1 could fully compress the front suspension and the stock 315's would just barely touch the fender with Methods. If Ford decided to make the fender wells smaller (unlikely) you'll have issues but you'll most likely be fine.
Since you already have Methods, why not go jump your truck and report back so we don't have to speculate?