Device for loading and unloading boxes on to and from a van

A method comprising:

• unloading a vehicle transporting boxes in a loading volume, said boxes being stacked on at least one trolley with wheels, wherein the vehicle comprises:
• at least one guide rail attached to the floor and engageable with the at least one trolley to guide movement of said trolley;
• at least one device exerting a horizontal force on a row of boxes placed on at least one trolley to move the row of boxes towards an opening of the vehicle;
• at least one roof bar holding, at an upper portion, at least one stack of boxes placed on a trolley;
• at least one stabilizer bar attached horizontally on the length of at least one internal wall of the loading volume, the boxes having at least one longitudinal sill extending on the side and on the top, the stabilizer bar hooking said sill by the top;
• and
• a rear door giving access to a rear of the row of boxes and a lateral door giving access to a front of the rows of boxes,
• wherein unloading comprises unloading at least one stack of full boxes through the rear of the vehicle, moving at least one row of boxes towards the rear by at least the length of a stack and introducing empty boxes through the side door to place them at the position thus released in front of the moved row.