What are the names of the Dukes' mules, and what do those names symbolize in the novel, Dukes?

Pulling the Dukes' wagon are Christmas, a white mule, and Easter, a black mule. Together they symbolize the Christian moral that all mankind, regardless of color, should work and live together in peace. In reality, the story has a white man, Nose, exploiting a black man, the fighter Baptist. Although the two men work together, it is Lucky who brings love to them both.