Yes, the light is still how they decide who to search. You should be fine but it might be a good idea to split things between you and FI. I think you're only allowed to bring $300 worth of gifts.
It was pretty easy getting in the carriage. But the steps are super small so getting out is tricky. I did trip a little and you can see it in the video.
I think you should ask to be assigned to someone else. She'll probably be running from your wedding to the next one, so at least yours is first. She will be able to handle both, but I'm surprised they are so close. Your ceremony will be just ending at the time she is supposed to go to the other bride. And yes, she will only show up 15-20 minutes before your ceremony. Don't worry, you will get to your wedding on time.