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I use light truck tires for trailer tire replacements. They work perfectly well and are much better tires. Read the specs and you may be surprised how much better.

Don't use used car tires or any used tires. Someone replaced them for a good reason. Furthermore you have no idea how old the tires are unless you can decipher the sidewall code. Tires should be replaced with new when the are six years old. Tread wear is not a consideration, age matters.