Lower bunk system for an industrial vehicle

A bunk system for a vehicle, comprising a structural board to receive a mattress and an occupant thereon, the structural board comprising:

• a main portion having a main front edge proximate a front of the vehicle;
• and
• at least one movable secondary portion having a secondary rear edge proximate the main front edge of the main portion, and a secondary front edge opposite to the secondary rear edge;
• and
• at least one coupling between the main portion and the at least one movable secondary portion, the at least one coupling configured to bias the at least one movable secondary portion in a deployed position in which the main portion and the at least one movable secondary portion are coplanar;
• wherein the at least one movable secondary portion is movable via the at least one coupling from the deployed position to a collapsed position upon a rearward lateral force of a front seat of the vehicle on the main front edge of the at least one movable secondary portion to reduce resistance to the rearward lateral force;
• and
• wherein the at least one movable secondary portion is movable in rotation relative to the main portion, the at least one movable secondary portion being hinged to the main front edge of the main portion.