New Units:
Rescue Pumper
A Rescue Pumper is a Pumper Tanker with rescue capabilities. I know of many departments that use these, and they could be very useful in game.
Rescue Quint
Rescue Quint is a Quint with Rescue capabilities. This one is a little less common than the Rescue Pumper, but still is a real unit and has reason to be in the game.
Police MCV
This has been requested a lot and it makes sense. This unit will allow a lot of new big missions without needing any police expansions.
Unit Update
Type 5, Type 6, Type 7 Engines should be able to use as utility units. I know of departments that use Brush Trucks as Utility Units.
Build Unit:
If these units aren't added or if they are, maybe we could get a Build Unit option. This would stop most vehicle requests and be a very cool aspect in the game. How it would work is, you can pick 1-3 different units to use and they would be combined into one unit. it could cost 200,000 credits or 10 coins to build and 10,000 - 15,000 to buy. You can buy the unit as many tines as you want after you pay the 200,000 credits or 10 coins to build. A new option in the Edit Vehicle menu should be a Trailer option. This option should only work on select vehicles like, Mobile Air, HazMat, MCV, EMS Operations Support. This option shouldn't cost any thing besides needing a Utility Unit. You would unlock all these options at the Captain rank. The Build Unit option would help all players with different playstyles, and the Trailer option is more directed towards the realistic players.