DUNLOP GRANDTREK PT20 TIRES Complaints

I have owned this vehicle close to three years and these were the all season tires that came with the car.I live in New England where I run snow tires on the car from October to April every year that I have owned the car. The car has 30K miles on it ,but the tires that came with the car only have about 10K or 7/8 tire tread left. The tires have become very noisy and are starting to cup. I did take the car to the dealer and had the front end checked out and nothing is worn or out of alignment. Tires were rotated at 5K intervals .I contacted Dunlop and was told there was not much they would do since the tires were made when Dunlop was owned by Goodyear. Dunlop is now owned by Falken. I was offers 30% off a new set of tires (Dunlop) as a good will gesture. A new set of tires will run about 1K with tax and mounting/balance. I should have to spend that kind of money on tires that are not worn, just poorly made. Falken admitted that they have a lot of complaints about this tire. Tire size is 225/60R18/ 2023 Toyota RAV4 XSE

The passenger rear tire experienced a catastrophic tread separation failure on the highway at speed limit speed. Since this was on the freeway, loss of control could have been experienced and caused a severe incident injury to drivers in the vicinity of the incident. The problem just happened and will be inspected by an authorized dealer. There were no warnings until the tire of the incident. These tires have been rotated according to schedule and have less than 21,000 miles.