Trailer Tire thoughts

[Ryank]

Ipurchased a like new trailer that had seen the water twice since being made in 1998. The trailer tires are original and have 100% tead they were not in direct sunlight but have a very tiny bit of dry rot so small it is almost not visible. I am just curious if these are still safe to use. If they were on a car I would say no way for the age but bias tailer tires are a different animal. C'mon and give me your thoughts!