The problem with these RV tires, especially 5th wheel tires, is that the manufacturers put on low priced tires that are barely rated for the dry weight of the trailer. They work great when the RV is delivered from the plant to the dealer, sometimes clear across the country.
Then we purchase the RV, load up 3,000 or more pounds of stuff, and fly down the highway on a 90 degree day at 75 MPH.....boom....tire blows and damages the RV.
I agree there are a bunch of "junk" tires out there and many of them are produced in China. But there are also a lot of RV's going down the road that should have G or H rated tires instead of what they actually came with..