Final answer:
The combination load permits the apparatus to make a forward lay from a position close to the water supply, typically used in firefighting. Heavy machinery like backhoes use hydraulic and mechanical lever systems, although these systems are not directly related to the concept of a forward lay in this context.
Step-by-step explanation:
The combination load permits the apparatus to make a forward lay from a location that is closer to the water supply. This can be primarily seen in the context of firefighting, where a combination load on a fire engine allows firefighters to quickly deploy a hose line by laying it out towards the incident scene as they approach from the water source. This method is crucial in firefighting operations to establish a continuous water supply, especially when dealing with large scale fires or in areas where water access points are limited.
Heavy machinery such as backhoes employ hydraulic and mechanical lever systems to manage loads and accomplish a variety of tasks. While this example highlights the type of machinery involved, the specific concept of a forward lay is more aligned with firefighting techniques and strategies.