Mikell,
Reading your post was almost like "de ja veau" We've seen the same thing a couple of times going across the Mac.
In fact, the first time we crossed it "south to north" with our new Cougar, we got caught by a big gust of wind that blew the entry door open. My guess is the gust caught the road side and entered the trailer around the slides???? That's only a guess, but with all the construction that's constantly on the bridge, we were unable to stop to close the door, so it stayed open narrowly missing those orange cones until we got to the toll station where my DW jumped out to close the door. We checked everything at the rest area just past the toll booths and no issues.
Since then, we fold the entry handle over the door rather than back along the trailer sidewall. Maybe a "false sense of security" but it might help if it ever happens again.
Enjoy the Cherry Festival, we will stay clear of TC until the crowds head home