Well I had to sleep on who is the comedy guy in the 2nd window of the bus. It's not Benny Sims but it is none other then the great often forgotten "Kentucky Slim" aka Charles Elza from the Elza Mountains of Kentucky. He would do a comedy/dance routine with the Foggy Mtn. Boys but was paid by Martha White as part of the show. With it being the 2nd bus and Slim on there and Uncle Josh on board it would date the photo to around 1958.