Airstream makes travel trailers but only the kind of travel trailers you pull by the vehicles bumper with a trailer hitch and trailer ball.
Airstream does not make any fifth wheel models of travel trailers though so if you want a fifth wheel travel trailer you'll have to get another brand of travel trailer in a fifth wheel model.
A fifth wheel is usually a bigger and heavier travel trailer and it wouldn't be really an Airstream design so Airstream doesn't manufacture nor do they plan to manufacture the fifth wheel option in travel trailers.
Still all models of the Airstream travel trailers are pretty light and easy to pull by just about any vehicle out there and they help with the towing vehicles fuel mileage too.