Unlike passenger vehicle tires that have an acceptable range of air pressure, trailer tires need to be kept fully inflated to the max pressure listed on the tire's sidewall in order to meet their load rating. If you run the tires at a lower air pressure, the tire's load rating will be unknown as most trailer tires don't load test their tires at a reduced air pressure.
Also, if you run your tires underinflated by 33%, you'll experience uneven tire wear with the outer edges of the tread... view full answer...
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