Accidents happen, especially to people lugging around two-ton wooden buildings on wheels and dragged around by horses, buffalo, and whatever else they can lash to their overly large carts. Someone needs to take care of the injured and ill and oft times people need these healers in the middle of nowhere, without any other living beings for kilometers. So, a special shifter with the academic skills to heal without magic houses themselves in this caravan along with passing healers from other species, sometimes even filled with the power to truly heal and not just distribute medication and bind broken bones.
