Vehicle trailer (2; 2'; 2"; 2"') for a tractive unit (1; 1'; 1"), in particular a semitrailer (2; 2') or drawbar trailer (2", 2"'), having a) at least one electric drive system component (4; 4'; 4"; 4"') which is integrated into the vehicle trailer (2; 2'; 2"; 2"') and which can be coupled to an electric drive system (3; 3'; 3") for driving the tractive unit (1; 1'; 1"), b) wherein the drive system component (4; 4'; 4"; 4"') which is integrated into the vehicle trailer (2; 2'; 2"; 2"') has an electric energy store (15, 16; 15', 16'; 15", 16"; 15"', 16"') which can be coupled to the electric drive system (3; 3'; 3") of the tractive unit (1; 1'; 1") in order to supply power to the electric drive system (3; 3'; 3") of the tractive unit (1; 1'; 1"), characterized in that c) the energy store (15, 16; 15', 16'; 15", 16"; 15"', 16"') in the vehicle trailer (2; 2'; 2"; 2"') permits stand-alone operation of the vehicle trailer (2; 2'; 2"; 2"') in the unhitched state in order to supply an electric assembly (20; 20'; 20"; 20"') in the vehicle trailer (2; 2'; 2"; 2"'), further characterized by d) a first interface (14; 14'; 14") for electrically connecting the drive system component (4; 4'; 4"; 4''') in the vehicle trailer (2; 2'; 2") to the electric drive system (3; 3'; 3") of the tractive unit (1; 1'; 1"), and/or a second interface for electrically connecting the drive system component (4") in the vehicle trailer (2") to a further drive system component in a further vehicle trailer, wherein the first interface (14; 14'; 14") and/or the second interface each comprise a power interface (24; 24'; 24"; 24''') and a communication interface (23; 23'; 23"; 23'''), wherein the power interface (24; 24'; 24"; 24''') serves to transmit electrical energy, while the communication interface (23; 23'; 23"; 23''') serves to transmit data, wherein the drive system component (4; 4'; 4"; 4"') which is integrated into the vehicle trailer (2; 2'; 2"; 2''') has a distributor (18; 18'; 18"; 18''') which distributes electrical energy between the electric drive system (3; 3'; 3") in the tractive unit (1; 1'; 1") via the first interface (14; 14'; 14"), the drive system component (4; 4'; 4"; 4''') in the further vehicle trailer via the second interface, the energy store (15, 16; 15', 16'; 15", 16"; 15''', 16''') in the vehicle trailer (2; 2'; 2"; 2''') and/or the electric assembly (20; 20'; 20"; 20''') in the vehicle trailer (2; 2'; 2"; 2'''). a) at least one electric drive system component (4; 4'; 4"; 4"') which is integrated into the vehicle trailer (2; 2'; 2"; 2"') and which can be coupled to an electric drive system (3; 3'; 3") for driving the tractive unit (1; 1'; 1"), b) wherein the drive system component (4; 4'; 4"; 4"') which is integrated into the vehicle trailer (2; 2'; 2"; 2"') has an electric energy store (15, 16; 15', 16'; 15", 16"; 15"', 16"') which can be coupled to the electric drive system (3; 3'; 3") of the tractive unit (1; 1'; 1") in order to supply power to the electric drive system (3; 3'; 3") of the tractive unit (1; 1'; 1"), characterized in that c) the energy store (15, 16; 15', 16'; 15", 16"; 15"', 16"') in the vehicle trailer (2; 2'; 2"; 2"') permits stand-alone operation of the vehicle trailer (2; 2'; 2"; 2"') in the unhitched state in order to supply an electric assembly (20; 20'; 20"; 20"') in the vehicle trailer (2; 2'; 2"; 2"'), further characterized by d) a first interface (14; 14'; 14") for electrically connecting the drive system component (4; 4'; 4"; 4''') in the vehicle trailer (2; 2'; 2") to the electric drive system (3; 3'; 3") of the tractive unit (1; 1'; 1"), and/or a second interface for electrically connecting the drive system component (4") in the vehicle trailer (2") to a further drive system component in a further vehicle trailer, wherein the first interface (14; 14'; 14") and/or the second interface each comprise a power interface (24; 24'; 24"; 24''') and a communication interface (23; 23'; 23"; 23'''), wherein the power interface (24; 24'; 24"; 24''') serves to transmit electrical energy, while the communication interface (23; 23'; 23"; 23''') serves to transmit data, wherein the drive system component (4; 4'; 4"; 4"') which is integrated into the vehicle trailer (2; 2'; 2"; 2''') has a distributor (18; 18'; 18"; 18''') which distributes electrical energy between the electric drive system (3; 3'; 3") in the tractive unit (1; 1'; 1") via the first interface (14; 14'; 14"), the drive system component (4; 4'; 4"; 4''') in the further vehicle trailer via the second interface, the energy store (15, 16; 15', 16'; 15", 16"; 15''', 16''') in the vehicle trailer (2; 2'; 2"; 2''') and/or the electric assembly (20; 20'; 20"; 20''') in the vehicle trailer (2; 2'; 2"; 2''').