I have used Duro tires exclusively on all my trailers. I bought the first set for my boat trailer back in 2005 and I have been nothing but impressed. I am so pleased with the product that I actually called the U.S. office and asked for a distributor in my area when I went to buy a second set. Not everyone stocks them because the name isn't well known outside of riding lawn mower, small utility trailer, and bicycle tires. I was able to source radials locally, but the the smaller PWC trailer tires I had to source over the internet. I feel they were the best deal for the money and honestly, I think I have the best quality too.
http://www.durotire.com/Portals/0/Images/Catalogs/TRAILER_TIRE_CATALOG.pdf
I felt that their product tended to be a little beefier than the other brands of comparable load ranges. They are all made in China which I can't really help. Most of the other brands are made overseas anyway except for a few Carlisle or Goodyears. I try and do my best to always buy domestic products :usa2:, but as you all know, that's pretty hard anymore.:frusty:
My 3.5k single axle boat trailer and my 5k single axle skid steer trailer have sets of Duro DS2100 Radials installed. Both of my PWC trailers have Duro HF232 tires installed.
Now, here is my disclaimer: I own a Coats 950 electronic wheel balancer. I have personally mounted and balanced each tire on my trailers. I can tell you that each tire/wheel assembly is just like a car tire in that most of the time, a little bit of weight was needed to correct for imbalance. I never feel my trailers pulling or vibrating at any speed. I always check tire pressures before I go anywhere since the trailers obviously do not get as much usage as my other vehicles. And just in case you are wondering: the two PWC trailers that I pull in tandem do not wag back and forth while pulling them at 70mph. My tongue weights are also adjusted accordingly.
To each their own experience, but for me I've had nothing but good luck with Duro brand trailer tires.