Please post pics of your F150s with 35x12.50-18s on stock wheels and please let me know how much rubbing you have and if you did any thing to cut down on the rubbing like put a wheel spacer or some thing else.
35"X12.50 BFG muds here, I've run them the last two winters and absolutely love them. I rub on the frame at full lock both ways, but it isn't bad. I did do a little grinding to a flange on the frame where the suspension lower cradle is welded to the frame. The lugs of the BFG's were catching on the flange and tearing the inside lugs up a little. 3minutes of grinding solved that, and now they just rub on the smooth vertical part of the frame and don't hurt anything. Oh, and I have a 2.5 Daystar installed. More pics in gallery