Scott's criteria is nearly identical to mine, minus the snow capability. (I'm in SoCal)

• I'm considering an 18x9 aftermarket rim with a +30mm offset.
• I'd like to go slightly wider/bigger on the tire, but do not want to lift or mod the cladding at this time.

Is this possible? VXKat was kind enough to point me to many threads on the subject, which seemed to indicate that trimming the cladding was necessary on an 18x9 with a 285/60. Would an 18x9 wheel require trimming even on a stock tire?