Goodyear makes some claims on long life formulations in their G670 RV tires. Ride, road noise, and handling characteristics should be considered. I think a few bucks more can be worth it. I also believe 10 years is not unreasonable to run a well cared for tire. Check out the Goodyear tire care guide ever if you buy Krapahamas!
Big O matched the Camping World Good SAMs sale price for me with free mounting. Make sure you go to a shop with a machine designed for truck tires. Most will handle 19.5 rims but the lighter machines can loose their grip and mess up Alcoa rims.