A plate mount is provided for mounting a plate to a frame assembly. The plate mount includes a generally cylindrical head extendable through an aperture the plate and having an upper surface, a lower face, an outer peripheral surface, and an alignment structure receivable in a slot of the frame member. The cylindrical head including a bolt-receiving bore extending through the cylindrical head along a bore axes at an acute angle to the upper face. A flange extending radially extending from the outer peripheral surface of the cylindrical head. The flange has a diameter. At least one spacer is positionable about the outer peripheral surface of the cylindrical head at a location between the flange and the plate.