Another here for leaving on.
So far, except for the very 1st night we used it, we've always set the awning up with either 1 or both side walls, rarely the front, but then we haven't done any only overnight stays yet either.
With the 12' tent, yes the roof is a bit heavier, but with it laid out flat over the whole tent roof area, the weight is distributed evenly.
Last camp we done, I did see 2 CT's pull their roof off when they packed up.