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To understand the Payload of a Truck, one must understand the terms GVW (Gross Vehicle Weight) and Curb Weight.

Curb weight or Kerb weight

Curb weight is the actual weight of the vehicle. It is the total weight of a truck that is coming out of a manufacturing unit with standard components as well as a full tank of fuel. This doesn't include any cargo, passengers or any additional equipment mounted by the buyer.

GVW (Gross Vehicle Weight)

As name implies Gross Vehicle Weight(GVW) is the gross weight of the truck.
It is the total weight which includes the engine, fluids, full fuel tank, the passengers, cargo and any additional equipment mounted.

Legal Payload

Payload is the actual weight the truck can carry including the passengers and materials to be transported.
So to conclude GVW is the sum of Kurb Weight and Payload.

GVW = Curb Weight + Payload.
Payload = GVW – Curb Weight.

GVW is directly proportional to the number of axles. As the number of axles increases, GVW also increases, which in turn results in an increased payload for the truck.

Payload is an important factor that has to be considered when buying a truck. This is what which helps you calculate how much load you can carry in a trip and how many trips you have to make per day. Overloading can cause serious mechanical problems to truck components. This can also cause serious road accidents. Overloading is considered a felony in many countries and indeed qualify for heavy penalties to both drivers and transport companies.