This excellent cartoon is from Lyle Baker and description from Peter Butler:
(Click on image for full size version)
David Butler (drivers seat), Eddy Shaw (back of truck) and Fred (Tatter) Crain (boat) went fishing at Burrenjuck Dam in the early 1960’s. They sent up camp at Carey’s reserve and went fishing for the night in a boat. When they got back all they could see was the tips of their fishing rods and the top of the Willies truck pocking out of the water. Lyle Baker drew this caricature after hearing the story.