I haven't been on the forum much. Sorry to reply months later
1) The carrier is one half of a bumper mounted bicycle carrier. It was a freebie from a friend. With a hack saw and spray paint, I modified it to just the right size.
2.)Clearance isn't an issue. I had to mess around with how it was mounted a little, but it seems to be fine.
3.) As far as I can tell, the sway bar works fine. It's a cheap, Harbor Freight model. I'm not expert, but I can't tell any sway while towing. I had some reason for mounting it on the driver side, upside-down, but I can't remember now why I did it like that. Maybe it was to be away from the wiring? I don't know, but I chuckled at myself this spring when I looked at it.
Thanks for the interest. My family loves this camper, and I bet you love yours too!