What is tandem axle?

A tandem axle is a type of axle setup commonly used in vehicles such as trucks, trailers, and buses. It consists of two axles placed close to each other, with each axle having two wheels. The purpose of this setup is to distribute the weight of the vehicle evenly between the axles, allowing for better stability and control while driving. Tandem axles are often used in heavy-duty and commercial vehicles due to their weight-carrying capacity and ability to handle large loads. They are also commonly used in vehicles that operate in off-road conditions, such as construction sites or agricultural fields. Tandem axle setups can be found in both mechanical and air suspension systems.