My informant in San Francisco recently mentioned, the RHD mail jeeps are still in service in his suburb at least. He wrote, they used to sell off the clapped out examples but that doesn't happen any more.
Reading this: It looks like the L134 'Go Devil' side valve engine was fitted in the The DJ-3A Dispatcher up to 1965 . So where were they sourcing the engines from ? Were these side valve engines made new up to 1965 ? If so, the engine had a 26 year life span of production in the USA.
https://cj3b.info/Siblings/Dispatcher.html
More reading
https://www.just4x4s.com.au/news-and...-3a-gala/14040
Article re: the L134 'Go Devil' engine. Didn't know it was also license made in Japan and Argentina. Would this have been for the Japanese jeep copies and the Argentine built jeep type vehicles ? The author of this article may be confusing the side valve L134 with the F head 134 ... needs some more research. Some of these motoring journalists do not do good research , they are not always 100% correct , the information should be taken as a 'maybe'
https://www.motortrend.com/features/...-encyclopedia/
Those Ben Hur trailers are scarce in this part of the world, not seen one myself but there I believe there are a one or two up North.