Hey Dan,
Offsets also are affected by tire sizing. With OEM camber specs the widest tire I'd run on a 9.5 +15 is probably a 245. Anything wider and I'd go with a higher offset wheel.
When dealing with proper offsets, often times it is trial and error. People get wheels and push the envelope around what is the normal offset to either fit more aggressive wheels and/or tires.
With beefy tires up front, the norm is typically a 265 with a 10.5 +22. Perhaps someone else can chime in with their front wheel/tire setup.
Hope I helped a bit!
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