Yes, I have gotten 16K + miles out of three (3) sets of PR2s and all still had tread when they were changed. Different areas of the country may have very different roads though and that could greatly change tire life. Also the temperatures here are never really high and that will also make a great difference in tire life; I think people who live in hotter climates, such as the southern US, have greater tire wear.
As someone else mentioned, the roads in AK may be pretty rough and that is also going to reduce tire life.
Using a very hard compound tire such as a touring tire (not a sport- touring tire) would probably be the easiest way to get the longest tire life but I have not heard of anyone using one of those on a C-14 so have no knowledge of how they would perform.
Brian
I had gotten 17,000 miles on my PR2s and I think BDF (Brian) has gotten about the same results. If I buy a different tire next time it would be a PR3. I also got over 11,000 on the stock tires and the rear is still good enough for a spare. And I got over 12,000 on the Dunlops with a front that is good enough for a spare. PR2s wore out very evenly.