One more picture of the Chevrolet 1311X3 15-cwt 4x2 GS truck in use by the LRDG. They received 25 of these in December 1941 and used them as so-called pilot cars:
A 1940 model 1311X3 in use by a British Army convoy (not LRDG) on their way back from Kufra returning to Wadi:
Source:
https://www.fjexpeditions.com/frameset/GJMostert.htm