I'm not sure how popular this idea will be, especially with players outside of the UK (As I'm only aware of UK Fire & Rescue).
In the service which I am playing (Devon and Somerset FRS) they have various levels of rescue capability - as shown by their types of units ranging from light, hybrid L&M and medium rescue pumps (Like the Rescue Engine in-game), as well as heavy rescue tenders which are equivalent to the Heavy Rescue Vehicle in-game. What I am suggesting in this thread is a change to the game mechanics and introduction of new units.
Minimum rescue capability - can be used to fight fires and deal with very minor rescue scenarios like animals stuck in drains etc... (In-game, the usual type 1/2 engines)
Light rescue capability - can be used to deal with standard traffic collisions as well as minimum capability incidents (In-game, a new unit called Light Rescue Engine)
Medium rescue capability - can be used to deal with light or below capabilities, as well as more dangerous traffic collisions and minor structural damage etc (In-game, a new unit replacing the current rescue engine, called Medium Rescue Engine)
Heavy rescue capability - can be used to deal only with rescue, basically the in-game heavy rescue vehicle, but would not be able to complete "Specialist Rescue" missions, such as stuck climber, trench rescue, medical emergency on crane etc. (In-game, in-game the usual Heavy rescue vehicle)
Specialist rescue capability - would not be able to complete anything light, medium or heavy, but would have the ability to complete specialist rescue missions involving height or confined spaces. Could also be required in full building collapse and major airport terminal collapse where people may be missing etc. (In-game, a new unit called Specialist Rescue Engine). With the introduction of the Specialist Rescue unit, I would imagine more unique mission ideas may come forward to expand it's use in-game at "required" missions.
The incentive to buy the lighter rescue vehicles would be a reduction in price, or rather an increase in price for the new vehicles:
Type 1/2: 5,000 Credits
Light Rescue: 10,000 Credits
Medium rescue: 19,000 Credits
Heavy Rescue: Same price (12,180 Credits)
Specialist Rescue: 14,500 Credits
Potentially there could even be new training for the specialist rescue unit which I suggest could take 3 days.
The main issue I see with my idea is that of giving unit's a double-role, as I am aware Sebastian is not keen on adding more of them - perhaps rather than making the light/medium rescue capability mandatory, it would act instead to reduce the time the incident takes to complete, and therefore the Light/Medium rescue units I've suggested could also have a coin-only purchase option until the rank of Captain, when I believe the current dual-role units unlock.
Please let me know what you think!