If you want to put the tallest tire under your commander with the stock suspension or a leveling kit, Here's what we recommend:

WIDTH __ OFFSETS
7 ______ + 3/+65
7.5 _____ + 9/+59
8.0 _____ +15/+53
8.5 _____ +22/+46
9.0 _____ +28/+40
9.5 ______ +35

Offsets higher than these can cause rubbing issues with your frame or suspension, offsets lower than these can cause rubbing issues with your fenders. If you are pushing these limits at either end you'll want to be more specific with your tire size.