Truck (yes, the fire-side people will scowl if you call anything a truck. then again, we don't run a ladder truck, we have a rescue squad which is The Squad, so no one has ever even thought to call an ambulance that)
(on the radio it is either Medic/Ambulance for ALS/BLS)
The thing in the back (same order):
I kind of like Wheels, but I've never heard that here.