I have the China GY thon's on our new 5'er. I have no intentions of running out and getting 16" tires or for that matter Maxxis tires. Had GY thon's USA made on my last TT and got 10,000 out of them with plenty left. I have plenty of reserve capacity left on the last TT (38%) and do on the new 5'er also (32%) I keep them inflated to 65psi. Don't drive over 65mph very often and not for sustained speeds. Usually around 62-64 freeway, and in the mtns 55-60mph or less. If I was close to max on tire load then I would switch to a higher rated tire.
With all that being said I know I can get a blow out for no reason, at least that's what they say. But at 4,000 miles a year average I'm going to run them for a couple years.