Glad FR took action. If you recorded the tire DOT serial it also would be good to file complaint with NHTSA on the "tread delamination" tire failure. Many times this type of failure simply does not make it into the NHTSA database and with out sufficient numbers there will never be any action from NHTSA.
If you do not have the DOT then it may not be of value as that is a key bit of information DOT needs. Everyone should have a record of the DOT of all their tires written down. This will help you know if you are involved if there is ever a tire recall in the future.
I write a blog on RV tire application and safety. RVTireSafety.com
Also give seminars on tires at RV events across the US. 40 years experience as tire design & quality engineer for major tire mfg. Freelander 23QB on Chevy chassis is my RV