[twindman]

Lynwood put me on to Union Pass a few years ago, as I go to Wy often. I don't think the Dubois route is too steep but if memory is right, a few hair pin corners. But the worst thing in my opinion is the wash board road. If you are familiar with them, under any type of load, your wheels start bouncing around and sort of sliding sideways a bit. Not too bad if you know what you are doing, but I really don't like washboard roads. I have never tried it while pulling, either. Just FYI.
Also, I went one year June 14 and the road right a the top had a 3-4 foot snowbank across it. People just went thru the field and went around it!