yea, like you said , the duratracs have a more aggressive tread than the SA, & look good too! the rubbing i had with the SA on stock rims, w/o lift was on the inner black plastic fender. so i did have to move it forward, id say, as long as your willing to do that, the 265/70 should be fine. as far as the 255/75, you will have to ask some of the other guys who have had experience with them. like you, i cant queit see a taller tire fitting even if its narrower,(again tho, maybe just moving or cutting the inner fender helps) but believe it or not, i even think there was someone who used the 275s w/o lift, lots of trimming tho.