Our 41v15 is a 2022. The rear bathroom sink goes to the rear black tank. I do not know about the washer dryer. I believe that grey tank 1 is your shower and bathroom sink in the master bath. I think grey tank 2 is the kitchen sink. I do not have a washer and dryer so I cannot guess where they go. I just emailed Alliance this morning asking if I am correct on the 2 grey tanks.