I can assure you that they do. I've owned three Airstreams and they've all leaked. Recent rains have revealed numerous leaks in the Overlander and I'm currently working on them. I've got a leak along the back wall in the bathroom and several in the front, on both the streetside and curbside. The front roof vent leaks and I suspect the roof vent in the back leaks also (this might be the source of my bathroom leak).
Fixing leaks is a process of elimination. Water travels downhill but it can also wick sideways along ribs, so with this fact in mind, it can be difficult sometimes to track down the source of a leak. Sealers you'll need to fix your leaks include Parbond and Vulkum. Parbond is best for small seams while Vulkem is better for wider seams or gaps.
So far, I've replaced all exterior pop rivets with Olympic rivets (sealed with Vulkem) and sealed all windows and main verticle seams with Parbond. The main door, Hehr windows, and rear Hehr clearview window seals have also been replaced. I've still got to work on the main roof vents and the backframe window gaskets for the Standard Hehr windows.
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