You know, there is no real way to tell. I've heard of Airstreams out in the AZ desert for darn near a decade in full sun and no issue, while I've heard others have had a type of corrosion issue. FWIW, ours has been indoor except for one winter and the trips we take with it and it may have some clear peeling/corrosion at the cut panel ends in one small spot.
I would keep it clean, keep it Walbernized and keep the tires covered when not in transit, it's the best you can do less putting under something or inside.
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