This is what we know already:
The Highwaymen artists are/were a collection of African American artists from Fort Pierce, Florida who painted vivid landscapes and Florida scenes. They painted from the 1950's to the 1970's and their works were sold commercially in galleries but mostly from the trunks of cars to passing motorists. These artists were masters at capturing Florida sunrises and sunsets.
The question is are there other artists out there other than those listed in many websites. We got a few Carribean Style paintings in frame, and we don't believe its hatian art. Did the Highwaymen frame their artwork? The frames might be newer.