The deaths triggered an outcry on social media, with users accusing farm owners of treating their low-paid, mainly female workforce "like cattle".
Both drivers were also killed in the dawn crash with the minivan carrying poultry in the poor central region of Sidi Bouzid, emergency services spokesperson Moez Triaa said.
Health ministry spokesperson Chokri Nafti said 21 people required hospital treatment for injuries sustained in the crash.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ