You have given us a GVW for your trailer. For replacement tire purposes you're required to use tires that equal or exceed the load capacity of your OE tires.
The ST205/75R14 LRC tires that came on your trailer have more than sufficient load capacity for your - I'm guessing - 2500# vehicle certified axles.
So, your down to tire brand recommendations and I don't do that.
I do recommend a tire brand that is easily found in your RV traveling zone.
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