Trailer assembly and associated self-erecting crane

A trailer assembly, comprising a chassis, a suspension device, a double-axle device, first wheels and second wheels, where said chassis rests, via said suspension device, on said double-axle device, wherein the double-axle device comprises a first axle supporting said first wheels and a second axle supporting said second wheels, and wherein the trailer assembly comprises a steering system to steer the first wheels and the second wheels during maneuvers below a low speed threshold, said steering system comprises a first actuator which is coupled to the first wheels, a second actuator which is coupled to the second wheels, and a control circuit connected to the first actuator and to the second actuator,

• wherein said control circuit comprises a driving device configurable in a low speed maneuvering mode in which at least one of the first actuator and the second actuator can be actuated to steer at least one of the first wheels and the second wheels,
• wherein, in the low speed maneuvering mode, the driving device is sub-configurable between:
• a synchronized sub-mode in which the first actuator and the second actuator can be actuated in a synchronized manner to steer the first wheels and the second wheels in a synchronized manner;
• and
• a desynchronized sub-mode in which the first actuator and the second actuator can be actuated individually and independently to steer either only the first wheels or only the second wheels;
• said trailer assembly further comprising a control device which is connected to the driving device to:
• select either the synchronized sub-mode or the desynchronized sub-mode when the driving device is in the low speed maneuvering mode;
• and
• select an actuation either of the first actuator or of the second actuator in the desynchronized sub-mode;
• and wherein the control device includes:
• a selection member to select among the three sub-modes comprising the synchronized sub-mode, the desynchronized sub-mode with actuation of the first actuator alone, and the desynchronized sub-mode with actuation of the second actuator alone;
• and
• a steering member to steer the first wheels and the second wheels.