not sure. there is so little info on LT tires. not even sure what the UTQG is,
as explained here:
https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=48
It's more important to read the DOT age of the tire, link below. Anything over 6 years is questionable and 10 years is scrap no matter what. Phoenix heat makes tires scrap over 5 years old. Run the old ones here and discover tire bombs leaving debris all over the road... Trailer tires, ST, appear to age faster than LT tires making 5 years a NQA replacement age IF they make it that long. Separation like you had usually leads to a blowout and can do so on the spare tire rack. Immediately let the air out of a tire that lost it's tread before you handle it via valve stem, or core, removal.
https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=11