The May/June 1960 issue of the California Highway and Public Works department periodical included an article of a survey of the Sierra Highway that included a CJ-5 and a wagon.
http://libraryarchives.metro.net/DPGTL/Californiahighways/chpw_1960_mayjun.pdf
Amazing how you find all this information Dave, I commend you for your time & effort.
I’m amazed I find anything new after 10 years. I do enjoy the hunt ….