Went from Phoenix to LA with the T63 front tire and 908 rear tire. No death wobble. Once I got into the crappy roads of LA county I had some wiggle changing lanes over wide grooves, but nothing I would consider dangerous.
Before I left the house.
What the T63 looked like after 350 miles of slab at 80-90mph. 95-110F ambient temps, so you know the roads were HOT.