And four wagons and eight oxen he gave unto the sons of Merari, according unto their service, under the hand of Ithamar the son of Aaron the priest. Four wagons - unto the sons of Merari - Because they had the boards, bars, pillars, and sockets of the tabernacle to carry, Numbers 4:31, Numbers 4:32, therefore they had as many more wagons as the Gershonites.
Related Commentaries of Numbers 7:8
Numbers 7:8
8 And four wagons and eight oxen he gave unto the sons of Merari, according unto their service, under the hand of Ithamar the son of Aaron the priest.