These are not ST, but they are 14" D range tires.
It appears from the description that there may be 2 versions of this tire with different load ratings, one with a 107 load index, and one with a 109. Also, while passenger tires are rated to carry 100% of the load max, truck tires are actually rated to carry 91% of the max load rating, and the same may be true of trailer tires. So calculate that into your purchase decision.
Tire Rack (copied from tirerack.com website, bad formatting)
Kuhmo radial trailer tire 205R14
Load Index 109 = 2271lbs (1030kg) per tire
Load Index 107 = 2149lbs ( 975kg) per tire
Speed Rating “Q” = 99mph (160kph) 109/107Q D Trailer Use Only Not required for
this tire.None 2271 lbs.
65 psi
http://www.tirerack.com/tires/tires....4857&tab=Specs
Discount tire says the following re the ST rating:
""All "ST" tires have a maximum speed rating of 65 mph.""
these have a 99mph rating.