There is plenty of confusing and contradictory information from all of the representative industries to and that is so unfortunate…
I doubt that anyone is saying LT tires can’t be used, and while LT tires are good tires and using a LT tire is a good choice if you can find one that fits at reasonable prices and only if reasonable mods are required to accomplish the change… reasonable is in the eyes of the beholder of coarse…
While the 857 is highly touted as a good replacement for some sizes I have read enough complaints about them to be uncertain if they are any better than a good ST tire… then there are other commercial van tires (commercial seems to be a marketing term) that are not rated as LT tires but are really euro metric passenger tires, much like the extra load and reinforced sidewall tires are and like them carry higher air pressures… all P metric and euro metric can be used as well but they need the sidewall stated loads de-rated by 9% when used for trailer use, but still could contribute to sway especially at highway speeds… also the de-rated load must meet or exceed the axle weight ratings…
Still there is a reason that no major tire manufacture will ever recommend using a LT tire as a replacement for a ST tire… they would sell their soul for a profit, so I find it hard to believe with all the marketing and deceit they employ in their marketing that they wouldn’t recommend the use of what is claimed to be a legal and superior tire for replacement of a ST tire… you need to hide from them (be deceitful yourself) that it is a replacement for a ST tire to get their blessing...
As far as origin, I have no faith in China to provide CONSISTANT and reliable quality at least not yet… their reputation for quality fade is earned and well deserved… maybe someday… but I don’t see them as a friend, ally, or partner that can be trusted, economically or any other way yet…