Yea, the ladders were a lot more taxing than we had initially expected. That being said, I've rock climbed before, so it wasn't too much of a problem for me, but it was much harder for my friends (especially if you start looking down). The stairs are definitely more exposed, but the cars stay on the roads closer inland. While we were in the barracks, we noticed that the "base" of the cars seems to be on the little triangle where three roads intersect, and they never go further out than that. We figured it was worth it.
"base" of the cars, view from the middle of the crane