Can anyone comment on the durability of the elongate when used in a 13’ opening? I would be installing it in the middle of a room to create a playroom for our son (and also to keep our dog out of the toys). I have searched the internet for reviews and found that they were mixed. Most reviewers said that it was sturdy when used with the extensions but a couple people said it was flimsy and it would sway when their children leaned on it. Anyone have any experience using it at this length? Thanks in advance.