Had it happen this summer during high wind gusts, now I don't travel without a bungee cord securing them. Before next spring I'll probably install some sort of retractable locking pin to hold them in place while traveling.
I don't know if it was coincidental, or not but I had just sprayed silicone on the stair folding joints a few days before it happened.
These stairs are by far the easiest opening I have ever had on a 5er, most you have to struggle to open, I'm sure that this is part of the reason for the unfolding in high winds.
JP
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