I always balance trailer tires. If you don't, they tend to bounce and cup. That produces a lot of heat which kills tires.
As far as running passenger tires, that is what is used in the low profile trailers, but XL tires are used which have a stiffer sidewall than a P-metric passenger tire. Sidewall flexing generates heat, which, as I have said, kills tires.
Running tires below their maximum tire pressure also allows more sidewall flexing, which....
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