What were the jobs of the Gershonite, Merarite and Kohathite clans?


At the tent of meeting the Gershonites were responsible for the care of the tabernacle and tent, its coverings, the curtain at the entrance to the tent of meeting, the curtains of the courtyard, the curtain at the entrance to the courtyard surrounding the tabernacle and altar, and the ropes—and everything related to their use.  Numbers 3:25-26
The leader of the families of the Kohathite clans was Elizaphan son of Uzziel. They were responsible for the care of the ark, the table, the lampstand, the altars, the articles of the sanctuary used in ministering, the curtain, and everything related to their use.  Numbers 3:30-31
The Merarites were appointed to take care of the frames of the tabernacle, its crossbars, posts, bases, all its equipment, and everything related to their use, as well as the posts of the surrounding courtyard with their bases, tent pegs and ropes.  Numbers 3:36-37
            These three clans were subsets of the Levite tribe.  Their job was to move the tabernacle and all the furnishings from place to place when God moved the camp.  They then carried those items through the wilderness to the next location.  The tabernacle had a lot of heavy parts and it required thousands to get it done.
            Only the men 30-50 years old could participate.  The Kohathites had 2,750.  The Gershonites had 2,630.  The Merarites had 3,200.  That’s a total of 8,580 carrying the pieces of the tabernacle, then assembling them at the next location.