If anything a Airstream is more stable than a 5er and yes I currently own both plus a MH. The only thing I do not like about setting up a Airstream is because of the Torsion trailer axles (no equalizer bar like on most 5ers) you often need a higher than level ball height. If the tongue is too low you end up with too much weight on the front axle that decreases the tongue weight to where the trailer wants to sway. Raising the ball height up above level solves this problem as I pull it with my PU without WD BUT this makes the rear drag more often. I've looked at lowering the rear axle 1/2" so I can go to level or even lower than level so the back of the trailer is less likely to drag on my 31' Airstream.
