mid-century vintage green tin toy truck box trailer painted Murphy, needs wheels

Cute old trailer (no truck), all metal with plastic wheels, some wheels missing. I can't find any makers marks, and have no idea who made it. Around here, I see mostly Structo or Nylint I think, but toys aren't really my specialty.

I love the little doors on the back, and it seems to me as though this is a cute piece to style up for the seasons - especially if your name is Murphy!