191 is fine, like CloudDriver mentioned, the hardest part is through Hoback and it's not even that hard and not too windy. It flattens out pretty much after that. Bigger issue through there is the wind can pick up, especially once you are out of the mountainy area and closer to Pinedale. We nearly flipped our old travel trailer on 191 between Pinedale and Rock Springs due to wind, but we also had an undersized truck pulling it (upgraded trucks after that trip)
🙂 I wouldn't be worried about it in a proper rig.
2020 Keystone Montana High Country 294RL
2017 Ford F350 DRW King Ranch
2021 Ford F350 SRW Lariat Tremor