We bought this small vacuum on our last roadtrip, because of the rocks, leaves and debris from camping in remote locations:
Shark Bagless Hand Vac - Walmart.com
It is probably too small for larger Airstreams, but it works great on the limited floor space in our 19' Bambi. Plus, it sucks up ROCKS!
Larger vacuums were too big to store, and smaller vacuums mostly just scattered debris without picking anything up. This one has the brushes and suction of a full-size vacuum, in a hand-held size. And, the price is right, too!