I'm a tire guy.
Yup, buy them in person. Verify country of production isn't china.
And don't accept tires with production dates over a year ago. The date code is in an oval in the sidewall at the end of the DOT code. It's 4 digits which consist of the week and last digits of year of production.
Also you ought to get ST which means special trailer, marked tires. though the LT's work. ST's are made to handle trailer use. Like tandem axle corner loads, long sun exposure, and being close to fully weight loaded all the time. Carlisle and Goodyear are the biggest and best brands. I have personally sent back lots of fails when I worked next to the highway in Las Vegas. People would pull in after hours on the interstate in 115 degree heat. No wonder they failed.
I'd buy Goodyear without qualm, they back their stuff, including damage caused to vehicles on which their failed tires were run.
Some of the vehicles that we serviced had wrong pressure (too low) and were still helped.
My boat trailer has Tow Max STR tires, they are good too.