just watch your wheels, and youll be fine. did it in my 80 about a month ago. I didnt feel stressed about it in the slightest..So wait, is it open or closed or...?
Excuse my ignorance, what about the narrow part? I did this run to the top in a full size / lifted Tundra about 6 years ago. Terrible idea but it made it. The 4 Runner shouldn't have an issue?