What would we think of changing the HazMat equipment so it can be attached to a HazMat truck? This would mean that the unit would count as 2x HazMat at a mission. It could also require someone to operate it; so running min personnel requirements you would have 1 HazMat trained for the truck and 1 for the extra equipment.
I am suggesting this change because, in my alliance, the NYC location is starved of HazMat vehicles and that holds up mission completion. This could save a lot of time and resources.