UPDATE: According to the author in the 1964 Jeep News Vol. 10 No. 7, this article was published in the September 1964 issue of Trailer Life (I previously guess it was in 1963).
I bought a wagoner literature combo off ebay that included the “Test the ‘Jeep’ Wagoneer” excerpt from an unknown issue of Trailer Life Magazine that also included the early Wagoneer brochure on the post below this one. There are still two sets of these available for purchased the last time I checked.
The writer, Bruce Grantland, concluded that the Wagoneer was a new type of vehicle for towing, better suited to towing long distances in remote areas better than any other vehicle of the time.