I think there were several reasons they were not popular. The first is added weight. Airstream shoppers tend to be looking for lighter weight rigs. The slide added a lot of weight. It was small-ish as well and the additional cost of a new rig with a slide vs no slide was probably just not a great equation.
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You have brains in your head. You have feet in your shoes. You can steer yourself any direction you choose. | Dr. Seuss
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