A hospital on wheels, more than important in dire or even war-like situations. The Airstream is more useful than your regular camper and in this case, is built out like a small military hospital for first responders. Front and rear windows are usually covered by large white panels with red crosses. These are easily detached when on the road or if the trailer needs to be repurposed. These Camper trailers were also used as quarantine quarters for returning astronauts.