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I check my tires on 6 different trailers with a tread depth gauge and have never seen even a hundredth of an inch different wear inside to out running them at max pressure. It just doesn’t happen.

The max pressure stamped on the tire takes heating into account. You run them at the max regardless of distance because they get hotter at lower pressure.

Manufacturers recommend the be run at max pressure because you lose both load capacity and speed rating with under inflation. I’ve never seen a case of a radial tire wearing in the center from...

Absolutely!

That is the speed they are load rated. Most are 65MPH. You lose capacity if you go faster.

What tire is that, and what does it say on your rim?

With a tandem trailer, there are few bad tires. With a single axle, you have to be careful. A trailer tire typically differs mostly because the tread isn't as aggressive since it doesn't have to...

While Carlisle does make some trailer tires in the US, it's a small portion. Most are Chinese.

You can't exceed the sidewall pressure unless the manufacturer tells you to.

The load capacity of the tire changes with inflation pressure. From the manufacturer's web site, here are the capacities of a typical 205-14 trailer tire at various pressures:

25psi-1170lbs
...