Slave Dollies utilise McGrath Industries' proprietary hidden high capacity micro castors. This mechanism allows smaller fork-lifts, typical of warehouse operations, to propel full size ULDs about at floor level. The Slave Dolly's roller deck can be configured for ULD transfer in either Narrow Edge Leading or Wide Edge Leading orientation to match interfacing equipment.
Slave Dollies provide an economical ULD transfer mechanism where typical warehouse fork-lifts are available. Note that because the fork-lift operator's view past the ULD is very restricted when driving forward, the fork-lift is usually driven backward over long distances.