Concur with TiAgX5 . 30k is plenty miles if there was a QC problem they would've corded much sooner. Since you mentioned these were the rears it must be indicative of the toe in problem? Please post alignment sheet when you get it done. Me personal wouldn't mix tire mfrs. Had Toyos on a previous truck and once they wore in couldn't stand the screeching around turns so wouldn't buy another set now.

Bright side: New Michelins all around!