Regardless of what we want, think or wish, I have yet to see any tire company advertised their LT tires for ST use. I appears they would rather lose sales rather than sell LTs into the trailer market.
Even those companies that do not make ST tires do not try to sell their LTs for trailer use.
The fact that some of the tire makers will tell you that you can use their LTs for trailer service, would indicate that they are not the first choice.
There is absolutely no doubt that the LT tires are tested to several more standards than STs. However, it appears the additional testing has little to do with the needs of an ST tire.
Why some travel trailer makers allow or recommend LTs may be related to the TT design or intended use. I softer ride or more aggressive tread bite for off road boon docking comes to mind.
All of this is a moot point, since there is no law that says you must use ST tires. If, for whatever reason, a person wishes to ignore the recommendations of the industries that make the tires and the manufacturers that use the tires, they are free to do so.
Heck, I suppose one could even consider passenger car tires because they used them in the old days. I wouldn't begin to advise such a crazy idea but then someone will surely tell me how well they work in this or that TT application.
Be safe.
