Interesting body. I imagine it was custom built to haul furniture? And then only in good weather.....
Might be the undertaker....used for carrying a casket???
The shop behind sold furniture among other things - may of course have sold coffins too, especially if it was a small town. It's likely the truck was theirs.
Furniture and food???
The food sign ends with "don't waste it" - might be a propaganda poster for the WW1 home front?
Now I've seen another picture of an open bed funeral car so maybe the T could be used for that too?