UPDATE II: Thanks to Fred, we have a facebook link to a couple color photos and a link to diaries (in French) thanks to the Guy’s grandson David: http://www.vehiculesmilitaires.com/viewtopic.php?f=159&t=355&hilit=sauterelle
UPDATE: Jalopnik published this story in March 2017 that gives more background to photos Charles forwarded back in 2015 (see pics below). I couldn’t find much info on the trip pat the time.
Jalopnik’s story: https://jalopnik.com/the-incredible-25-000-mile-road-trip-through-africa-tha-1823690388