Serval folks pointed me to a Hemmings article by Daniel Strohl that lightly addresses the early claim of a CJ-2A capable of pulling a large trailer at a speed of 60mph, specifically the trailer shown in the iconic photo seen below (a PR photo that appeared in multiple places early in Universal Jeep advertising).
Hemmings article: https://www.hemmings.com/stories/2020/05/01/lost-and-found-overflow-the-little-jeep-that-could