I'm trying to pick out new rims for my '09 Duramax and can't for the life of me come to a conclusion as far as rim offset. Does anyone have a great knowledge of what offset does in terms of tire rub? Right now I have 275/65/18 Toyo A/Ts on 18x9 rims, not sure of the offset of them although I believe it's 0mm. On the new rims I'm wanting to get 275/70/18 Nitto Trail Grapplers and am wondering what offset on a rim would help out with the tires potentially rubbing, which I think they will rub a little on a 0mm offset rim. Does a negative or positive offset give the tire a little more clearance from the fender well? And also would said offset make the whole wheel and tire stick out pretty far? I'd like to get it as close to flush with the outside of the fender as possible. Wondering if I'm trying to have my cake and eat it too... Any help would be much appreciated.