Agricultural vehicle for collecting and possibly processing fibrous and/or granular products or any other fodder for the purpose of distributing these, said agricultural vehicle being an autonomous agricultural vehicle extending along a longitudinal axis and comprising, on one hand, a vehicle body comprising a receiving and mixing tank and a chassis supporting the tank, on the other hand, a picking-up and transporting unit (2, 3, 4) comprising a picking-up head provided with a picking-up member for picking up the product, preferably a rotary picking-up member consisting of a rotary cutter, and a loading arm equipped with a transfer device that is able to transport said picked product to the tank and, on the other hand, means (5a, 5b) for bringing about and guiding a pivoting motion, the loading arm being mounted on the vehicle body and being able, by virtue of said means (5a, 5b) for bringing about and guiding a pivoting motion, to pivot in a vertical plane about a pivot axis that is horizontal and perpendicular to the main median plane so as to allow the picking-up member to move vertically when the loading arm pivots, the agricultural vehicle being characterized - in that the overall width of the picking-up member is less than or equal to half the overall width of the vehicle body, said overall width (L1, L2) being defined as the maximum extent of the vehicle body, and respectively of the picking-up member, measured in units of length, in a direction perpendicular to the median plane, termed main median plane, of the agricultural vehicle containing its longitudinal axis, - in that it comprises means (6a, 6b) for bringing about and guiding a movement in translation, and in that the loading arm is mounted on the vehicle body, being able, by virtue of the means (6a, 6b) for bringing about and guiding a movement in translation, to move in translation in a transverse direction that is perpendicular to the main median plane so as to permit a transverse movement of the picking-up head and its picking-up member, that is to say in said transverse direction, between a first translational end position defined by a first median plane, parallel to the main median plane, of the picking-up head or of the loading arm and a second translational end position defined by a second median plane, parallel to the main median plane, of the picking-up head or of the loading arm. - in that the overall width of the picking-up member is less than or equal to half the overall width of the vehicle body, said overall width (L1, L2) being defined as the maximum extent of the vehicle body, and respectively of the picking-up member, measured in units of length, in a direction perpendicular to the median plane, termed main median plane, of the agricultural vehicle containing its longitudinal axis, - in that it comprises means (6a, 6b) for bringing about and guiding a movement in translation, and in that the loading arm is mounted on the vehicle body, being able, by virtue of the means (6a, 6b) for bringing about and guiding a movement in translation, to move in translation in a transverse direction that is perpendicular to the main median plane so as to permit a transverse movement of the picking-up head and its picking-up member, that is to say in said transverse direction, between a first translational end position defined by a first median plane, parallel to the main median plane, of the picking-up head or of the loading arm and a second translational end position defined by a second median plane, parallel to the main median plane, of the picking-up head or of the loading arm.