UPDATE II (July 20, 2018) : Keith provided portions of a document that show the agreement between Karl Probst / R.N. Harger and KAISER.
UPDATE (July 1, 2018) : Barry found a set of specs that could be a match to this prototype. Also, Keith noted that there were 6 different designs from the Probst-Harger” collaboration.
Original Post June 26th: Barry spotted this photo on the Kaiser Permanente history site. The jeep is listed as a 1943 Model 1160 “Kaiser Lightweight Jeep”. I’m not sure if this was supposed to be an Airborne prototype or just a concept lightweight jeep. Henry J. Kaiser is on the right. I think that’s Karl Probst on the far left; Rollin N. Harger might be seated in the middle.