Read my last updated link above? Here are some comments: "
Travis Peters, the couple's nephew and a longtime photographer and editor at 13News, said his aunt and uncle were very intelligent people. Ronnie was a proud U.S. Air Force veteran who loved antique radios and was ahead of the curve when it came to technology.
Beverly worked for defense contractors and also loved technology"
"As a lot of people suspected, it was bad GPS directions," Peters said.
A short time later, however, a rescuer heard a car horn. It was Beverly, honking out "SOS" in Morse code, just as Ronnie taught her during the week.
It sounds like this wasn't a cognitive issue.
EDIT: I just looked at the You Tube video & the nephew stated they saw campers along the way so they probably didn't pass RVs on the road; they just saw them camping.