we just purchased a 2013 Dutchmen Denali 287re. The control panel shows there is 2 gray tanks yet there is no dump valve for a second tank. I decided to let the gray tank 1 fill completely to see if i...
I think that 2 gray tanks is often due to plumbing requirements, like the bathroom and kitchen being located far apart. Is that the case for you? I wouldn't be surprised at all to see an incorrect panel installed in an RV either.