Rolling base for a telescopic mast of a plate-lifting apparatus, comprising, with reference to the use position: - at least one pair of support plates that are intended to be fastened to a foot of a lifting apparatus mast, each support plate having an axis of symmetry; - three arms (20, 30) that are each provided with an orientable castor (21, 31), one fixed arm and two arms that are mounted in a pivotable manner between two support plates, symmetrically on either side of the fixed arm; - each support plate having, on each side of the axis of symmetry, at least three blocking orifices (40, 41, 42) that are intended to be positioned next to holes in each pivotable arm and are intended to receive a removable blocking pin for blocking the pivotable arms in three different angular positions (P0, P1, P2) with respect to the axis of symmetry: - a first blocking orifice corresponding to a minimal angular position, referred to as the "storage" position, in which each pivotably mounted arm is parallel to the fixed arm and to the axis of symmetry of the support plates; - a second blocking orifice corresponding to a maximal angular position, referred to as the "loaded transport" position, in which each pivotably mounted arm forms an angle (α1) greater than 105°, preferably between 110° and 160°, advantageously around 120°, with the axis of symmetry; - a third blocking orifice corresponding to a first intermediate position, referred to as the "vertical fixing" position, in which each pivotably mounted arm forms an angle (α2) greater than 90° and less than the loaded transport position, preferably between 100° and 115°, with the axis of symmetry, provided that this angle remains less than the loaded transport position, characterized in that said fixed arm is fixed to the mast between two support plates, in line with the axis of symmetry of the support plates and of the mast, and in that the second blocking hole is further away from the axis than the third blocking hole. - at least one pair of support plates that are intended to be fastened to a foot of a lifting apparatus mast, each support plate having an axis of symmetry; - three arms (20, 30) that are each provided with an orientable castor (21, 31), one fixed arm and two arms that are mounted in a pivotable manner between two support plates, symmetrically on either side of the fixed arm; - each support plate having, on each side of the axis of symmetry, at least three blocking orifices (40, 41, 42) that are intended to be positioned next to holes in each pivotable arm and are intended to receive a removable blocking pin for blocking the pivotable arms in three different angular positions (P0, P1, P2) with respect to the axis of symmetry: - a first blocking orifice corresponding to a minimal angular position, referred to as the "storage" position, in which each pivotably mounted arm is parallel to the fixed arm and to the axis of symmetry of the support plates; - a second blocking orifice corresponding to a maximal angular position, referred to as the "loaded transport" position, in which each pivotably mounted arm forms an angle (α1) greater than 105°, preferably between 110° and 160°, advantageously around 120°, with the axis of symmetry; - a third blocking orifice corresponding to a first intermediate position, referred to as the "vertical fixing" position, in which each pivotably mounted arm forms an angle (α2) greater than 90° and less than the loaded transport position, preferably between 100° and 115°, with the axis of symmetry, provided that this angle remains less than the loaded transport position, - a first blocking orifice corresponding to a minimal angular position, referred to as the "storage" position, in which each pivotably mounted arm is parallel to the fixed arm and to the axis of symmetry of the support plates; - a second blocking orifice corresponding to a maximal angular position, referred to as the "loaded transport" position, in which each pivotably mounted arm forms an angle (α1) greater than 105°, preferably between 110° and 160°, advantageously around 120°, with the axis of symmetry; - a third blocking orifice corresponding to a first intermediate position, referred to as the "vertical fixing" position, in which each pivotably mounted arm forms an angle (α2) greater than 90° and less than the loaded transport position, preferably between 100° and 115°, with the axis of symmetry, provided that this angle remains less than the loaded transport position,