I replaced all 3 of my tires this year on my 2002. I decided to go with Maxxis
www.maxxis.com that I bought from the manufacturer online. I did an extensive search online and could find NO bad things about this brand. I made sure to have the tires and wheel balanced too, which the factory (TM) does not do.
I do like what I see regarding the Kuhmo tires, a little higher load range could be good, but keep in mind that at 65 psi, a blowout will do a lot more body damage to the trailer as would the 50 psi in the load range C tires. Just my .02