במדבר, פרק ד׳, פסוק מ״ד

The census of the Levite families reveals a practical alignment between manpower and physical responsibility. The adult men of the Merari family numbered three thousand two hundred, making their group significantly larger than the neighboring families of Kohath and Gershon.

This clear numerical advantage likely explains their specific duties during the travels of the Israelites. Because they possessed a much larger workforce, they were assigned the most physically demanding task of transporting the heavy wooden boards and the heavy bases of the Tabernacle [ביאור שטיינזלץ].