Should be ok, GYs in that size have a good rep. If you ever want more "piece of mind" change over to 17.5" wheels/tires from www.trailertiresandwheels.com
I did that 8 years ago and have never had a flat/blowout.
Spent 40 years in Evanston, WY, from 1980-90 in the second-most recent boom/bust.
You work in Kemmerer or Superior?