I just got off the phone with two people from the Forest River company who deal with our specific trailer. Neither person knew that 45 gallons was dedicated to the little sink, while the other 45 gallons was dedicated to everything else. The third person I spoke with knew the information and stated that they had to build it that way due to the steps. They were left with no other option for the tanks. I told him that I can understand the point, but they should change the brochure and website documentation to clarify, not to only list "90 Gallons" as the grey water storage. It can be misleading.
Students do not care what you know until they know that you care.