EMS LSU is the Logistics Support Unit. Responds to multi fire and most 10-32's(MCI's). It carries spine boards, and lots of bandages and BLS equipment. There are normally 5 up and running on a good day.
Ladder Co's in the City. Some have specialized duties. Such as Chemical Protective Clothing(CPC), SOC Support-used at Collapses and Tech Rescue's. Some did have the Highway Response Unit, TL170 had one for wrecks on the Belt, not sure if still used. Those are just some type of Co's that would have the second piece truck.