A shifted belt is highly unusual these days. After all, this is not the 70's and 80's anymore and tire technology has come a long way. However, there is not a lot back there that can cause a wobble. Nearly impossible to bend an axle, I'm sure you did not hit a big pothole or curb to bend a wheel, cannot see bushings or U-joint causing this, so a shifted belt in a tire is plausible.
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