Numbers 4:31

This is what they are responsible to carry as their entire service in the tent of meeting: the frames ¹  of the tabernacle, its crossbars, its posts, its sockets,

Ex 26:15; Nu 3:36,37; Nu 7:8,9

¹ sn More recent studies have concluded that these “boards” were made of two long uprights joined by cross-bars (like a ladder). They were frames rather than boards, meaning that the structure under the tent was not a solid building. It also meant that the “boards” would have been lighter to carry.