Lining for rear-unloading dump truck body, equipped with such a lining and loading/unloading method therefore

The liner has a foldable pocket (1) including a bottom (1A) and a lateral peripheral wall that is connected to the bottom. The wall comprises flanks (2, 3) forming the pocket. The flanks and a rear end face (5) of the pocket are positioned respectively opposite to longitudinal faces (33) of a dump truck body. The rear end face of the pocket is provided with an opening (7) for unloading contents from the pocket. Guiding units (8, 9) enable guiding of movement of the flanks of the pocket. An independent claim is also included for a method for loading/unloading contents from a dump truck body.