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One of the most significant differences between an Airstream and most other brands is in aerodynamic design. Because the front, side and rear profiles of the A/S are rounded, the form is inherently more wind resistant. The rounded tail of the trailer is the most important, because this is where drag is created. A form which is square or blocky at the rear creates an area of low pressure just behind it as it moves and this "vacuum" is what drags on the trailer, resisting forward momentum. If you were to look at an Airstream undergoing wind tunnel tests, you would see very little disturbance to the air at the rear of the trailer, thus very little drag. The result - the trailer tows and tracks easier and with better stability.
Additionally, as others have pointed out, the trailer is just constructed more soundly and of better materials than the other brands. Windows are high quality tempered glass, door hinges and latches are automobile grade - slam the door all you want, it won't fall off in your hand. All A/S are leak tested under high pressure spray at the factory ... the list goes on and on.
All in all, you can't buy a better-built trailer anywhere in the world. That's not to say that Airstreams are perfect, but they are alot closer than any other brand. If you want an investment to last you the next 30-50 years or more, than the Aistream is your best bet.
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