I did not have the same experience as the previous poster going over Teton Pass from Jackson towards West Yellowstone two summers ago. 10% max grade with a 1-ton SRW diesel and 9000lbs 30' TT in tow... so I did have the advantage of an engine brake. Since it was summer and warm at the time, there was zero chance of any ice. Yes, you want to take it slow as there are curves within the steeper sections of the road but the worst part of Teton Pass, going in the direction I traveled it, didn't seem to last for too long. Based upon all the danger warnings I pre-read about Teton Pass, I expected worse. It's not a pass to take lightly but I would have no hesitation going over it again with my combo so long as there was no possibility for ice.
Maybe it is worse travelling it from Idaho to Jackson???