Do yourself a favor, and move tires to the top of your list. Most trailer tires are only good for about 5 years. Tires do come with a date code on them, so it is easy to tell how old they actually are. The majority of blowouts and tire failures happen due to dry rot, which can be present even though it is not very obvious.
https://www.tirebuyer.com/education/how-to-determine-the-age-of-your-tires