A picture would be very helpful. The round rigid tubes, will be your waste tank vents.
I cannot tell for images online what that 5" long widget is. It does not appear to line up with anything on the floorplan. If you can add a picture of it, that would be very helpful. What does it look like inside the space?
Floorplan from Jayco's website
Picture from the web
I do see a bump to the right of the waste vent, which I assume is the widget you are talking about.