Why is Airstream any better than the other brands?

[Narnian]

I'm in the market for an old trailer to live in for about three months. After I'm done living in it, I plan to use it instead of my pop up for the seven or eight "adventures" I have every year.

I am using an old FS Jeep to tow with. It can tow 5500lbs. That includes any gear I throw in the Jeep and all the stuff I throw in the trailer. I'm guessing that between the stuff I toss in the Jeep and the trailer, I will have between 750 to 1000 LBs of gear in it, so I would prefer a trailer that's not too heavy.

There is an ad for a 1972 25' landyacht. I've mostly been looking at late 80's travel trailers from the other brands, but this landyacht (sight unseen) has me curious. Other than the unique appearance of the airstreams, are there any benefits not found in the box trailers? Do they weigh less? Are they easier to tow? Are they nicer inside? What is the attraction?

PS. What makes a land yacht a land yacht?