[jeepinstien]

You can mount 12.5's on an 8" wheel.
I ran this combo for years and put over 100,000 miles on this combo without problems.
The benefit is more sidewall bulge and less wheel damage.
The only reason I'm running 10" wheels now is for the bigger footprint.
38's don't look right with a narrow footprint. I have seen 7" wheels with 12.5's but thats too narrow.
My .02 worth.