Hi Jim; After they completed their training and began the trek to the valley, they encountered a road that had been washed out. The people who were walking took a long detour and walked around the problem, but those riding in the wagons had tractors fill in the road for them. The producers explained, in the narration, that the "time constraints" of the show made this necessary.

After seeing that, I remarked to my family, "If they stop at an ATM or check their email, we're changing the channel".

If looks could kill (they liked the show) I would have been dead.