I am just throwing out the name of "The Ark".
For decoration as well as educational value, the wagon could be decorated with the critters of the Plains, Males and Females.
Both our domesticated beasts, as well as the beasts of the wilds would be represented in paintings, furs and hides, decorations of horns and teeth, etc.
This would not be the first time such decoration has been used. A tavern in Turia bears the decor and decoration of the wagon camps.