Highway 6 in AB Through Waterton Lakes and Hiway 17 in MT

We drove that road to the US border just a little over a year ago. I can't remember any reason why a MH would have a problem. The road surface was good and it's wide enough. Mind you we were in our truck but I wouldn't hesitate on pulling our 5er along that road. It's a picturesque drive from Pincher Creek also. You do have to drive by the Waterton Park entrance, then start watching for your right turn to go to the States. About a 45 or so minute drive to the park entrance, depending on your speed. Stay safe.