Um 275/60r20 is a factory Tire size.. it's a 33x10? Or 11? I don't recall exactly. So it would fit regardless.
A 33x12.5 rubs because of wheel offset and width not height. 275/65/20 is a 34-34.5 depending on brand and tread, also fits factory height. Will catch wheel well liners if they're muddy and hanging low, driveway approaches etc. But that's an extra inch of Tire.
275/60/20 you're doing a lift or level purely for aesthetics or you have an offset that is causing issue with aftermarket wheels.