Ken, these are questions that can only be answered by Trailmanor.
However I have been told that they have now switched to a better polyurethane-hybrid caulk (3M). The caulk they used in repairing my Elkmont was certainly superior.
As for expandable/folding line ... I have no idea why they did not have similar problems to the Elkmont when the old silicone caulk was being used. Perhaps, as you sugggest, there was more of a structural problem in the door area, unique to the Elkmont, that was compounded by the poor caulk.
I like to think that many of these problems are now behind them. Only time will tell.
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