I have tried it for Foam and Hazmat and the game does not recognize the supplemental equipment. Off-road collision calls for a hazmat vehicle, don't have one close by so I bought equipment storage and hazmat, and assigned it to a heavy rescue truck. Sent the crew to school for hazmat and sent it to the scene. The scene is still calling for hazmat. Same thing for the foam needed in a national archives fire. Sent two type 4 trucks with the foam add-on and the mission is still calling for a foam tender. Apparently, none of them are working for me, I have tried the technical rescue, and nothing.
I know it's something simple I am missing but I just don't see it.