Tires: Tire - DOT, dot code, t davis

Question
I just purchased a tire for my trailer ST225/75D15. I would like to know the age of this tire.  The tire has DOT R2HH.  I've looked at several sites that explains how to read the "DOT" but I'm confused with the "DOT" that's on my tire.  Please help.

Answer
T Davis,

Everything you wanted to know about DOT Codes:

http://www.barrystiretech.com/dotcoding.html

And then - you need to look on the other side of the tire.  What you have is a partial code - the plant and the size.  The full DOT code - including the date code - is only required on one side, and it appears that the tire has been mounted with that side in.