Trailer tires or LT truck tires for car hauler

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=219

Some key excerpts...
"Also consider that Special Trailer (ST), as well as Light Truck (LT) tires are fully rated for trailer applications."

Then...
"Industry standards dictate tires with the ST designation are speed rated to 65 MPH (104 km/h) under normal inflation and load conditions.

However Goodyear Marathon and Power King Towmax STR tires featuring the ST size designation may be used at speeds between 66 and 75 mph (106 and 121 km/h) by increasing their cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load."

So if you want to tow over 65 mph you need an LT tire or the Goodyear Marathon or Towmax STR tires.
I wouldn't use P series tires, why would you they cost more then basic ST tires? Money no object I'd use LT tires but they don't even make them in the size I need for my camper so I use radial ST tires.