A wheel-supported frame for an agricultural harvester header having a tongue and a pivotally connected transverse frame, a retractable transport wheel connected to the tongue, and a pivoting mechanism for pivoting one of the supporting wheels approximately 90 degrees to align with the deployed transport wheel. The invention enables the harvester to be easily reconfigured between an operating configuration and a transport configuration. By rotating the transverse frame to align its transverse width with the direction of travel during transport, deploying the transport wheel, and aligning one of the normal support wheels with the transport direction of travel, the harvester is reoriented for transport along its lateral axis. The lateral transport apparatus is easily reconfigured by a single individual and requires no additional equipment beyond that integral to the harvester in order to reconfigure the harvester between transport and operational modes.
