I have the exact same 27' rig. And i am in the infant stages of a full monte. I read some threads by the veteran member, specifically, (Uwe, Toastie, and Aerowood), they are craftsman, and have already done, all the things we are dreaming. Check out their threads and take notes. I am updating all my holding tanks, and putting them in the basement. Fresh water just in front of axel, black will stay where it is, and grey between them somewhere centered. Friend me, and we can keep up with each others progress.