Trailer tires or LT truck tires for car hauler

Rotten tires will come apart easily.

That said, An ST rated tire has a diminished speed rating as opposed to a passenger or an LT tire. I've seen some ST tires as high as 88 mph and I think Goodyear & Marathon have a/their tire designed to operate from 65 mph to 75 mph by inflating the tire by 10 psi<iirc>. Also a few years back I inquired to one of my tire suppliers as to what all were the differences between passenger & St tires! I was told that the ST tires had an additional compound in the tire construction to resist UV ray degradation...because of a trailers purported "dormancy"...and sitting in the Sun.

An ST tire that is a Bias tire versus a Radial has a stiffer side wall that won't roll as much as a radial.

Race the car on the track at high speeds, not on the trailer being towed!!

65mph on a trailer on a freeway is pushing common sense IMHO.