An unpowered axle located behind the primary drive axle on a vehicle is termed a tag axle. Typically found on heavy-duty vehicles like trucks, buses, and motorhomes, it serves to increase the vehicle’s load-bearing capacity and improve stability. Functionally, this type of axle helps distribute the weight of the vehicle and its cargo over a larger surface area. As an illustration, consider a large recreational vehicle carrying significant water, fuel, and passenger weight; an auxiliary axle helps to ensure safe and controlled operation.
The addition of an unpowered axle offers several advantages. It permits a higher gross vehicle weight rating, enabling the transportation of heavier loads without exceeding legal weight limits. Furthermore, it enhances braking performance and reduces stress on the primary drive axle and suspension components. The historical implementation of such axles reflects the growing demand for vehicles capable of carrying increasingly heavy and bulky loads, driven by developments in transportation and logistics.
