It is easy to call them half-truths, falsehoods, advertising hype etc. but they published it and made it available to the public. That means they can be sued if the above is not true.
How many of the would-be experts voiced here would be willing to defend their statements in court?
Personally I go by the end users recommendation, that is why my DW’s van tires are inflated to 36 lbs. while and my half-ton’s tires are only inflated to 32 lbs. That is what the vehicle designers recommend for day to day driving.
When I am towing at or near the Max cargo I run the tire pressure up. I do this because I like it when the tires are not squatty.
I also run ST on my TT because I have never seen any tire manufacturer advertise the LT or P tire for trailer use. If they would rather lose sales than sell their tires for trailer service, there must be a reason.
I have seen ST tires advertised for TT use in the RV magazines. They were not afraid to stand behind their product.
We are all free to choose based on our own reasoning. The above is mine. These choices are not a test, they are not a race, and they will not appear on your permanent record.