Bantam?
From what I can tell the trailer was originally red with black fenders. I've been researching prewar Bantam trucks and noticed a common paint scheme is red with black fenders. Also they had 6 lug wheels with hubcaps similar to the spare on the front of my trailer. Also, it looks like this 1937 Bantam truck has the exact same tailgate chain setup.
From what I can tell the trailer was originally red with black fenders. I've been researching prewar Bantam trucks and noticed a common paint scheme is red with black fenders. Also they had 6 lug wheels with hubcaps similar to the spare on the front of my trailer. Also, it looks like this 1937 Bantam truck has the exact same tailgate chain setup.