We brought our 2021 reflection 278bh home October 2020 and stored it on the north side of our home shielded from the sun and weather. While checking tire pressure before our first trip last week we noticed small cracks between the side wall and treads on two of the Goodyear endurance tires. Date code 12/2019. Contacted the dealer, who then passed info to grand design. Waiting to hear back from the dealer. How can the tires possibly be bad already, everyone raves about the Goodyear’s. We put less than 200 miles on the tires. Any advice on how to proceed would be greatly appreciated, this is our first trailer and don’t know the ins and outs of warranty issues. I was going to contact grand design myself also. Couldn’t find anything on the internet of someone having bad tire on their unit right away! I didn’t closely examine the tires when picking up the unit, assumed new tires would be in good condition.