What is dead weight ?

the intrinsic weight of a structure or vehicle, excluding the weight of passengers or goods.

Total weight of cargo, store etc  or weight which a ship can carry

Dead weight is the weight of a railroad car, truck,etc., as distinct from its load or contents.

The maximum carrying capacity of a ship, expressed in tons, of cargo, stores, provisions and bunker fuel. Deadweight is used interchangeably with deadweight tonnage and deadweight carrying capacity. A vessel´s capacity for cargo is less than its total deadweight tonnage.

This the total net capacity weight of carrier can load cargoes safely.

It is the total weight of cargo, stores, etc., that a ship/truck carries or can carry at a particular draft.

Total allowed cargo weight a unit can carry safely, cargo including store, bunkers, provisions, crew etc