Bird
Epic Contributor
Wen, I think you'll find the ultraviolet rays of the sun are the main causes of tires cracking. That's the reason they make tires specifically for trailers only that have some different compounds to slow down the cracking process, and it's been awhile, so I don't remember all the details, but the bottom line is, I wouldn't worry about them cracking if they're stored inside out of the sun.
Bird
Bird