Which of the following is NOT a method for controlling spreading?

The choice of increasing weight is not a recognized method for controlling spreading in the context of vehicle operations, particularly with a vehicle like the MTVR Dump Truck. Controlling the spread of materials, such as gravel or sand, relies primarily on methods that can be actively managed during operation. Secure chains, adjusting chains, and adjusting speed are all practical strategies that can enhance the uniformity of spread and the control of the material being transported or dispersed.

Secure chains are essential for ensuring that the load remains stable during transport, thereby preventing shifting that can lead to uneven spreading. Adjusting chains can influence the flow of material and how it spreads from the dump bed. Adjusting speed directly affects the dispersion of the material, enabling operators to control how rapidly or slowly it is laid down.

Increasing weight, however, does not inherently improve the control of spreading. While additional weight may influence traction or stability, it does not provide any means of actively adjusting how material is dispersed from the vehicle. Thus, this option stands apart from the practical techniques used to manage spreading effectively.