I have fought the short trailer tire life for many years. The fact is they do start to deteriorate as soon as they come out of the mold. How they are stored from that point on effects that short life. Heat is the worst enemy for a tire so living in the Arizona desert the last 16 years was killing my tires when leaving them outside even if they were covered. I averaged 18 months on a new set of ST tires before one of the four separated or started showing signs of separating. Five years ago I started removing the wheels & tires when not in use and stored them in the garage. I haven't had a tire issue since. Sure it's a bit of work but it has saved me way more time and money in the long run. I just replaced this 5 year old tires just because I was leery of running them any longer even though they looked new.
