Yes, you do need to get ST tires for the trailer. No comment on brands since I just got my first trailer and it shouldn't need new tires for at least a few years!
Originally Posted by SouthernTrailsGA
Load rating is a key factor in Trailer Tires, imo you need a minimum of a Load Rating D or an 8 ply tire.
Wouldn't the appropriate load rating depend on the weight rating of the trailer? For example, I just got a 2-horse trailer and its tires are load rating C, up to 1820 lbs each (more or less, don't remember the exact number off the top of my head). The other trailers I looked at in my search also all had C-rated tires. The GVWR for my trailer is 7000 lbs, so the tire load rating exceeds the GVWR of the trailer (4 x 1820 = 7280), and way more than I plan on putting in it (~3200 lbs for the trailer itself, 1000 lbs for my horse, and maybe a couple hundred more for gear) I can see why you'd need a higher load rating on a heavier trailer, of course, but not sure why I'd ever pay more for D-rated tires on a trailer my size.