Thinking I was looking at the back of a 40s delivery van.... . I looked into the yard to see what the cab looked like, and found a late 50s early 60s Ford truck

 

 Seeing a truck that is sinking into the back yard in the city? That's uncommon

so there's no cab, but I still think that was a moving truck box, or construction equipment truck tool area

doesn't this seem similar to a work truck with access doors? What else could it be?