My 2 cents and just for fun.
The debate between ST tires and LT tires on a TT has been going on for some time.
I am not currently an Oliver Trailer owner, but It's on my bucket list. Maybe Oliver uses LT tires because they are made in the USA! There may be other reasons and I am not a tire expert. It would be interesting to learn more on why Oliver has made that decision. Also I am neutral on the subject between ST or LT.
But I have not had good luck with anything made in China.
I recently had a tire less then three years old blow out on my current trailer. I have since purchased a tire pressure monitor and I will never tow again without one.
I have never overloaded my current trailer and I have weighed the trailer before each trip, I am always well under the maximum axle and GVWR load. But my trailer manufacture installed four D rated tires on dual 5200 LB axles. D rated tires are designed for a maximum load of 2,540 ea. X 2 = 5,080. A little short of 5,200 Lbs. must be some kind of new math! So after the tire blew, I went with ST, E rated tires. I could not find one made in the USA, so at least I chose a name brand.
The next year I had two aluminum wheels crack, they were on the opposite side of the blown tire. Again, they were genuine Cheeena brand, you call it China, I call it Cheeena for CHEEP.
Now Goodyear has come out with a Made in the USA ST tire, the Endurance. It will be interesting to see if Oliver make a switch.
PS: There is no warranty expressed or implied to the accuracy or sufficiency of the information provided and the user assumes all risk with its use.