Yeah this is pretty regular for wilderness rescue. Also just think about getting a stretcher to a remote location over rocks, looks, etc.

At best it's slowed down, at worst you have to switch out porters of the stretcher every 10 minutes or something to keep the injured moving out ASAP.

Like you said how close is an ambulance, how close to a spot the helicopter lands.

An absolute logistical nightmare that fortunately they are prepared for!