A trolley to carry a connecting board

A trolley to carry a connecting board, comprising a rectangular panel (1) carrying outlets and intakes (2) for air and electrical ducts, the panel (1) being horizontally orientated and extended in its upper and lower edges in respective horizontal supports (3), each support (3) holding a set of two pairs of vertically axled ball bearings (4) and one horizontally axled ball bearing (5), all of them applied against external sides of a pair of laid-flat T-shaped profiles (6), opposedly and horizontally fixed to a trailer or semi-trailer (10).