A 33x12.50 should fit with a 4 inch lift, going off of the Mickey Thompson website their 33x12.50 measures 32.7x12.1. I have 33x12.50 Duratracs which according to the Goodyear website measure 32.8x12.5.
They are very close to the rear flares at full flex (track and sway bar attached), but fit just fine. FWIW I have 3.75 inches of backspacing on 15x8 wheels.
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