Rashi: Two were in front and two in back, like big wagons.

Rashi, Targum Yonasan: This is like Nesarim (planks). Radak - the letters are reversed (Seren - Neser). Malbim -they were like a floor for the Mechonah. The board was four by four Amos.

Rashi: The corners of the base on it.

Rashi: They stick out above the planks in the corners of the base.

Gra: Of the four planks of the first Misgeros (not between the Shelabim), two of them were longer, in order to put the wheels on them. The Mechonah sits on this wagon, and its wheels are on the ground.

Malbim: There are two kinds. (a) The boards that were like a floor for the Mechonah, four Amos by four, stuck out from the Mechonah. (b) The boards under the Kiyor inside the Mechonah stuck out from under the Kiyor.

Rashi: They were molten below the Kiyor, which rests on the base. ¹ Radak - this is unlike the Loyos, which were beaten flat.

Malbim: The Kesefos that stuck out from the Mechonah (refer to 7:30:4:3), they were molten.

Rashi: On the side of each of the Kesefos, male and female were illustrated. This is like "Ish El Achiv" (Shemos 25:20) said about the Keruvim (Radak - and "Ishah El Achosah" (Shemos 26:3) said about the curtains).

Malbim: The Kesefos that stuck out from under the Kiyor (refer to 7:30:4:3) were attached to the boards afterwards.

Tzuras ha'Bayis (from the author of Tosfos Yom Tov, printed in Rashi, verse 37): It is so when they want to move it to a desired place, they will not need to turn it about ¹ .