The document describes an extensible shelving modules conveyor called UNL that is designed for loading and unloading vehicles. It has an adjustable height and movable modular shelves to minimize space and allow fast movement of conveyable items between 50mm and 1200mm in size weighing between 0.25kg and 50kg. The conveyor provides ergonomic transport of items to reduce physical stress on workers and speed up operations compared to manual loading and unloading.