FDNY, question for any members in FDNY alliances

I’d never heard of this in it until I looked it up a moment ago but I think currently the best fit would be a foam engine

I am building FDNY an have not put the purple K into the game yet but when I do I plan on using type-2 engines

I am currently using the Water Tanker in game but my plan is to build the foam expansion and use the Foam Unit.

I personally use water tankers/pumper tankers for the majority of the niche units (Purple-K, Satellites, Thawing Units) so I have tenders when needed. Currently I have foam units as the same, and have yet to run into an issue where foam shortages are more than 1-2 engines worth.