sounds like Fasteagle tales :)
Actually Michelin still recommends them for trailer service.
What the problem is some folks ask the dealer or Michelin if they can be used as a replacement for a ST E with a 3400-3600 lb rating. Of course they can't.... as the XPS has only 3042 lb capacity. This backs the dealer/mfg into the liability corner. Michelin doesn't know if the trailer owner has the expertise to choose a tire with enough capacity for the size of the axles (axle loads).
And some tire dealers still think they can't mount a LT tire on a trailer that has a ST tire sticker....and vice versa. Or even mount a LT on a 1/2 ton truck that came OEM with P tires.