We have driven it several times, but not in the last couple of years. The up and down through Flaming Gorge has some steep descents and climbs. Some years US-191 has a better road surface and other years the state routes South from Green River are in better shape. The really steep descent with 10 switchbacks is on US-191 going South into Vernal, UT. Gear down early. I have walked the rig down the really steep sections in first and second gear. If you have an exhaust break make sure it is on.