The 2007 and later Escape trailers have 14 gallon black and 20 gallon gray water tanks. The older models like mine have 7.5 gallon black and 14 gallon gray water tanks. As we like to dry camp, I wanted to increase the waste water storage capacity to my 2006 Escape.
I installed a custom made auxiliary tank system that added approximately 13 gallons of extra waste water storage capacity (though I only plan using 11 gallons of capacity to keep the vent line clean) and a new capability to drain the gray water tank through a garden hose. Although I can transfer both gray and black water into the auxiliary tank, I will primarily use it for black water storage and use the new garden hose drain to keep the gray water tank level below full. Of course the new gray water drain will only be used where allowed.
Please see this link to FiberglassRV.com for details. http://www.fiberglassrv.com/board/in...topic=25621&hl