My experience is that it's usually obvious on the vehicle itself, but the agent in the booth will have no idea how your assigned vehicle is configured (it's in their system, but hidden way down deep).
Same experience here. One quick way to tell is to look at the keys if the agent has the keys but the cars are out in a lot. The model name will typically (but not always) be followed by a 4 if it's a 4x4/AWD.