Depends on where you live...as hail is an extremely common occurrence here,
I previously lived in Denver. I understand thunderstorms and hail. In that area hail is a greater concern than in some other parts of the nation. Nothing I said mitigates the fact that a TT can be damaged by hail. Just what is the real risk and how to mitigate it? I like torsion axles, like hydraulic disk brakes for stopping quickly, like timeless designs, and no rubber roof or fiberglass to delam. But, that is just me. I really really like to still have a very servicable tariler after the payments are all made. That is more important to me than hail. More important than outside storage or the curved interior. As to the poster concerning the wood floor in an Airstream, it probably is a weak point from the standpoint of longevity. What travel trailer does not use wood for floors? In some ways it is a moot issue today until a manufacturer makes a coach without wood floors.
Obviously Airstreams are not for everybody. People should get what they want. I am good with that. I was just responding to the hail issue that I was asked my opinion on. And I can't imagine hail not damaging the cheap plastic vents, skylights, tank vents, antennas etc. that are on the roof of any RV including Lances. When the pervious posters Lance needs a new rubber roof it may cost more than the entire coach is worth. It just moves the costs of the roof from fixing it now due to hail to fixing it later due to design obsolence. Pay now or pay later. I hope he is happy with his Lance in 12-15 years.
As to slideouts, AS made some models with them during in the mid 2000's.