I'm just trying to understand the practicality of this unit in the game. For road accidents, a single engine is able to handle the call. For the building collapses, heavy rescues make sense. Is it more of wanting a cheaper option to buying a heavy rescue which isn't that pricey to begin with? A dangerous goods accident would be more of a hazmat team need than the need of having a rescue engine on scene due to the fact of the unknown/known materials of the cargo.
I wouldn't say a cheaper option, i would just like to make it clear that when I made the original post I did not intend for it to be put in the game straight away, there has been a lot of talk of USAR lately in multiple topics and the way I see this unit is the middle man between a type 1 and a heavy Rescue. For example if we were to say that USAR was going to be something that was implemented a heavy Rescue would then require its crew to be USAR trained, this vehicle can then respond to the more major incidents such as building collapse etc as there would be a USAR requirement. The Rescue Pump would not require training for its crew as it would not count as a USAR unit, it could attend incidents such as a bin fire all the way up to jobs such as the Dangerous Goods Truck Accident where it will work alongside all the other required units. The Rescue Pump however due to the equipment on it could not attend building collapses that might require shoring teams as it would not be able to carry the equipment.