I saw a big super duty today with some really tall and narrow tires. they were Michelins mounted on stock 16x7 rims. the tread was an aggressive mud design similar to super swamper TSLs. 36 to 38" tall. I don't think they were retreads, wouldn't go with the custom purple flame paint job.

anybody know what they are?

 

They were probably Michelin Military radials. IIRC they're the XZLs.