Trailer Tires

My open full deck trailer needs tires. It weights 1990 lbs empty and I haul my 3000 lb race car on it. It currently has 6 ply tires on it. I'm looking at the Carlisle Radial trailer tires 6 plys rated for 1820lbs and 8 ply rated for 2150lbs. I can get both for within a few bucks of each other. Which one would you pick and why?