Anyone cut lower 1/4 in front of rear wheels to fit 315/60/15?

May be over complicating it, but if you can, you might want to try cutting a wedge out and moving the material forward to gain the space. This allows you to keep the form of the lip. Might end up with a cleaner look. Might not be possible. But I think that's how I would attack it.
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That’s exactly what I was thinking but wanted to see what others have done before I dig in.