Slight tire rub at full lock can't identify

[bossbolognese]

I put 0 offset 17x9 wheels on my truck with 285 /70 R17 toyo AT3s (as close to OEM in size as I could find). I'm getting some sort of rubbing at full lock only when backing up and steering with the wheels pointed to the left. It almost feels like it'll rub and skip (kind of a thud thud thud noise/feeling) but I stuck my head back there and can't physicall see any marks or idea of what it's rubbing on. Before I go and ask someone to stick it on a lift I was hoping someone might have an idea on how to figure out what it's rubbing on. I would think it'd happen on both sides but I've only noticed it on one side.

Thanks

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[bossbolognese]

I'm an idiot. Entire time I thought it was coming from the drivers side (had mudflap rubbing issues before) but it was the passenger front crash bar. Admittedly this is the first time I've ever gotten aftermarket wheels/tires that have a different offset. But I'll just leave this up as a shame on me for not looking hard enough. At any point, pop the two crash bar bolts loose and push the bar forward and it clears now so mystery solved.