I was reading the post and decided to call Clam about my Cabela's 360 ice shelter. I had two issues, one the zipper is hard to close and sometimes we couldn't close it at all because of fear of breaking the zipper. The second was that the shelter would jump around in high wind.
For the zipper it turns out that we correct in pulling or pushing the shelter poles to be able to close and they are designed to be tight. For the wind problem they said to put the tiedowns only 6" from the skirt so the tent is being pulled down, completely opposite from a normal tent.
You were correct the customer was great.
JG