I found this question/ answer to be interesting.
Q. Did GGP's suburban overheat on the way up to the campsite forcing VDK to pull/tow it?
Klein: There was a trailer situation - depending on whose story you listen to.
A "trailer situation" gives us another stopping point on the way to the campground.
And IMO, in a trailer situation/ car over-heating, pulling off the road and accessing the problem could be where little DeOrr was injured.
Lots of commotion, and no one watching little DeOrr.
Also, how strange is it to buy 3 phone chargers between Idaho Falls and Leadore?