i had 14s on my trailer, I put used radial tires since the old ones on it were dry rotted to the point they wouldnt hold air.
My size was 195/70/r14
I pick up a used tire off ebay for $30 shipped, 2 more used tires at a salvage yard for $10 a pair. And finally got a 4th free from a local gas station with 90% life left.
I only got used tires because i had sold the trailer for $400 and just wanted it tow-able for the buyer.
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