Ahh yes... Tow Max tires. Their know as blow max around the commercial trailer industry. And about the same around many rv websites.
Generally 16" load G tires were aimed at the regional service trailer industry and have a much better service life on road trailers than 15/16/14" load E/D/C blow max sizes.
Tire rot.... or what ever you call it may or may not show on the outside but those type issues can start internally. The tire may look new on the outside.
Your way over tired on the trailer so those load G are no where near max loads so with your smaller trailer they should be fine. Just make sure you have a good spare aired to the max.