A truck with a body mounted rotatably on a frame (2) and comprising a load-bearing structure (5) rotatable between a transport position and a plurality of tipping positions in which it is angled, and at least one openable side board (10) couplable to the load-bearing structure (5) at the bottom by first constraining means (14), and at the top by second constraining means (15). The openable side board (10) is movable between a closed position, a plurality of first open positions in which it is rotated downwards and a plurality of second open positions in which it is rotated upwards. The first constraining means (14) keep the openable side board (10) coupled when it is in the first open positions, and leave it free when it is in the closed position. Finally, coupling means (20) retain the bottom of the openable side board (10) when it is in the closed position and the load-bearing structure (5) is angled at an angle which is less than a predetermined reference angle ± 0 , and leave it free when the load-bearing structure (5) is angled at the predetermined reference angle ± 0 .
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