Got a 08 crew cab silverado with factory 20" rims and a 1-1/2" leveling kit. Bought some 305/55/20 nitto terra grapplers and i'm having a little rubbing issue. Should I do a 3" lift, buy rims with a different offset? What will work. I don't want to beat my fender well in. Also would some type of spacers work? Let me know what you all have run into previously. Thanks!