Not sure what you getting but the Jayco 1206 POPUP floorplan will look something like this
There is no PLUMBING per say as the toilet is a cassette pottie version. It can be just a toilet or a combo toielet/shower combo depending which option you have.
These are the two different options
There is no smell whatsoever with these units. All is captured in a pull-out 6-gallon pottie on wheels where you can tote off to the local bath room and dump down the toilet.