UPDATE: This post originally appeared August 14, 2015:

1) Lining up on the first really flat ground they have seen on the entire caravan, the Jeepers stop at Miller Meadows for their Sunday lunch.
This 1955 article in the 1955 July/August issue of Willys News covered the recently completed Jeep Jamboree. The author reported that as part of an awards ceremony, the award for the oldest passenger went 68 year-old Mike Millard who was a former Rubicon Springs-Lake Tahoe stage coach driver. He must have had some great stories!
On another front, compare photo #5 to an original at the online archive of California. There it is dated 1958. Given this appears in a 1955 Willys News I’d say their date is incorrect.