Special Appliance Types

Sorry if there is already a post for this, but if there is, I cant find it.
Something that would be nice to see is a vehicle that you can purchase, but after the purchase you can check different boxes that allow you to choose what equipment types you want on said appliance. A good example is that in Lincolnshire, all of the hazmat resources in the county are not on a dedicated vehicle for hazmat incidents, rather they are on the county's 2 water carriers. This would mean the game mechanic for these vehicles would have the hazmat and water carrier equipment types selected. I just think this would be really nice to see, let me know if you think it would be a good feature to have to improve on realism for counties that do things differently.