Having camped at Carl G Washburn State Park on the Oregon Coast several times. I have learned not to save my black tank and try to dump it at the camp site as there hook-ups are not very air tight and have had overflow problems, YUK!! They are not open at the top, but open to the side. I bring my tank stuff home with me to dump or dump at the designated dump station.
Bobbo, I have thought of adding an accumulator tank to my 2007 Outlook also, but wondered where you mounted yours? I don't see an area large enough. Did you go into the area next to the kitchen sink? Thanks for any information.