That's exactly what I thought, but there's so much brush in the way, that just from the photos, I could not clearly see there was no engine or placement for one. Since you were there, you can see way more than we do, from just the photographic perspective.
Unless a puller was really big, aux motors were actually also quite rare during that vintage, simply due to materials stocks by the manufacturer. One has to realize that any castings and such for engines, were way more in demand for tractors, trucks and even autos back then, due to the recovery/rebound from the War.