That tire is made by Kenda. Here is there web site:
Here is the answer I got when I was searching for a tire better than the Marathon. Replys like this one drove me to go to 16 inch wheels and LT tires.
From: Hank Chang
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Sent: Thu 10/20/05 11:05 AM
Cc: Cindy McGrail (CMcGrail@kendausa.com)
The trailer tires all designed for speed rating at 65 mph. Lots of people towing at much higher speed is not what tire manufacturer recommended.
The consideration of upgrading to 16" tire seems related to loading capacity issue instead of speed rating issue. As far as I know, there's no 16" tire has same loading capacity with same OD as 15" tire. Even if it has that most likely will be a LT tire not the trailer tire. You will having the risk of using LT tire or pay more for people make the reinforced LT tire to be fit for trailer application.
We will have a 10P ST225/75R15 tire at 2830 lbs capacity available soon if that's what you need.
Hope this help!