I have researched this on the site, but wondering if this would work for me? As you know sink drains very slowly. My pup has the drain underneath the camper. Has a hose bib type connection so you can attach a garden hose for gray water. Why can't I just put in a tee fitting under the sink with a hose (same size as the sink drain) and take this up to above the level of the sink. Attach it to the counter top just like your home kitchen sink? All it needs is an air relief for it to drain quickly. Your thoughts?