Kit for connecting a semi-trailer, corresponding road tractor and semi-trailer and method for delivering goods

Kit for connecting a semi-trailer, corresponding road tractor and semi-trailer and method for delivering goods. Kit for connecting a semi-trailer of an articulated unit, where the semi-trailer comprises a semi-trailer chassis (1) and a coupling pin (3) for a fifth wheel (5) of a road tractor in the front part of said semi-trailer chassis (1), where the kit comprises a coupling pin (7) for a fifth wheel (5) of a road tractor, suitable for being attached to the rear part of the semi-trailer chassis (1). This way the road tractor can be coupled at both ends of the semi-trailer, which makes it possible to transfer either of the two boxes (9) from the semi-trailer to the road tractor, thereby facilitating the delivery of goods where an articulated unit cannot pass.