A versatile, folding, symmetrical chassis for agriculture simulates a rigid levelling beam as two halves pivotally joined. Attachment beams connect the two-part levelling beam to a drawbar. In a roadworthy transport mode, the two halves are brought forward, lie parallel to each other and are restrained in place. In a working mode, the levelling beam is towed over a soil surface while aligned across a tow direction, and the attachment beams are spread into a symmetrical triangle each side of a third, inextensible median beam or chain which supports the levelling beam at the pivot joint.
