UconnJack, tires fall into that "pretty important" category. I believe in purchasing from a reputable dealer who will stand behind their tires. I is "important" to go with a good brand, important to get the right size, important to maintain and care for them and really important to watch them carefully. That said, I have had the old Marathons, a set of Maxxis and now am on my second set of Carlisle Radial HD ST tires. These have been the best so far. I also uprated mine to LRE when a D load would have probably covered my weight adequately. I run mine at about 72psi for normal trips but will load them up to 80 when it gets really hot outside.
Some people believe that a tire manufactured overseas is automatically a bad tire. Conversely, they believe that if it was made in the USA then it has to be good. Goodyear manufactured their Marathons here and had trouble with them. They moved manufacturing overseas and still had trouble. They also caved to the "buy American" pressure and brought the Marathon back. None of it seemed to help. They junked the Marathon and went with an improved tire. So.....WHO makes the tire is more important than WHERE it is manufactured. Just my 2 cents.