The song is Columbus Stockade Blues, but in Yodel version.
These guys take away the blues, and turn it into a hillbilly yodel, good and curious version.
I could not find information about them, only that they lived in a caravan.
The traditional country song "Columbus Stockade Blues" was performed recorded in 1927 by an early country music duo Darby_and_Tarlton Tom Darby and Jimmie Tarlton and in 1930 by Cliff Carlisle in the album Cliff Carlisle - A Country Legacy 1930 - 1933