“Moses took the carts and the bulls, and gave them to the Levites” (Numbers 7:6). “Moses took the carts and the bulls…” – Moses took them and allotted them in accordance with his judgment. “Two of the carts and four of the bulls, he gave to the sons of Gershon, according to their service” (Numbers 7:7). “Two of the carts…” – because the service of the sons of Gershon was only the sheets of the tent, the coverings, the screens, the hangings, and the cords with which they would support the sheets.
One end of the cords was tied to the sheets, and their other end was tied to the pegs. They would imbed the peg into the ground so the wind would not furl the sheets. Because their service was not heavy, he gave them only two carts. However, for the sons of Merari whose service was arduous and heavy: boards, bars, pillars, sockets, and cords for all their vessels and all their service, he gave them four carts. That is what is written: “And four of the carts…[he gave to the sons of Merari]” (Numbers 7:8).