Does anyone run a 315/75R16 on a stock Rubicon wheel?

Yes. Cooper STT Pros with 1.25” spacers for 3.75” effective offset

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I also run 315/75R16 tires (Duratrac) on Moab wheels. 1.25" spacers work fine. They barely rubbed on my Swayloc at full turn and flex, but now do not because I had to add a washer to each steering stop to accommodate the hydro assist cylinder.

You will need the 5"+ of lift. Get the hub centric Spidertrax spacers if possible. Makes it much easier to center the wheel