ISO 1103:2007规定了轻型拖车或大篷车与牵引车之间机械联接装置兼容性所需的尺寸，当后者装有联接球时。联接球周围的间隙空间旨在允许牵引车辆的联接和分离，以及在机械装置的联接和分离期间的安全操作。 ISO 1103:2007适用于设计用于将O1和O2类大篷车和轻型拖车连接到M或N类车辆的连接球。不一定适用于特种车辆牵引的特种挂车。

ISO 1103:2007 lays down the dimensions necessary for the compatibility of mechanical coupling devices between light trailers or caravans and towing vehicles, when the latter are fitted with a coupling ball. The clearance space around the coupling ball is intended to allow coupling and decoupling of towed vehicles, as well as safe operation during coupling and uncoupling of mechanical devices. ISO 1103:2007 applies to coupling balls designed to couple caravans and light trailers of categories O₁ and O₂ to vehicles of categories M or N. It does not necessarily apply to special trailers drawn by special vehicles.