With a shorty like that you might get away with just 2 stabilizers. My Argosy came with those cursed "portable" aluminum screw-jack things for each corner, and I found them annoying and inconvenient.
I installed BAL crank-down stabilizers. There's a particular part number that works right for Airstreams, because they have to be installed somewhat inboard and have a long shaft so they're easy to access and operate.
Most places that carry Airstream parts will have (or can get) the right ones. As it happens, I purchased mine from Out of Doors Mart
, they had a price break for a set of four.