Disclosed herein is vehicle (1) with trailer (2) operatively connected thereto with a cardan (3), said cardan (3) comprising a power take-off, said power take-off being switched off when said cardan (3) forms with said ve- hide (1) and/or with said trailer (2) an angle (α β) smaller than a first threshold value and/or larger than a second threshold value and being switched on when said angle exceeds again said first threshold value or goes below said other threshold value, due to suitable actuators. According to the invention, it provides angle (δ) detection means between the steering wheels (5) and the axle (A) of the vehicle and means apt to correlate said angle (δ) between the steering wheels (5) and the axle (A) of the vehicle (1) with the angle (α β) comprised between the cardan (3) and said vehicle (1) and/or said trailer (2). Such a vehicle consists advantageously of a tractor with a towed load. According to a preferred embodiment, said vehicle further comprises an electronic level.
