My fifth wheel trailer is the same weight as yours with a 2500 lb hitch weight. When we bought the trailer I had the dealer take off the Good Year Marathons (China bombs) and put on Maxxis 8008 tires which I was happy with, but I found it difficult to find replacement Maxxis tires.
After a lot of research I decided to replace the Maxxis tires with Bridgestone 250 LT tires and I am extremely pleased with the tires which I have now used about 2 years. With the Maxxis tires I needed a wheel alignment every year, however with the Bridgestone tires I no longer require a wheel alignment. At the current time there is about 15,000 miles on the tires and the tires still look brand new.
Hope this helps.