We did that trip, from Price to Vernal a few weeks ago. I thought that it was one of the tougher pulls that we've encountered. Lot's of heavy haul trucks grinding up the hill at 10 MPH.
And the downhill was a treat too, no major issues, everything worked fine, tranny temp and water temp were all in specs.
Beautiful country. I didn't know they had so much oil infrastructure in that area.