Originally Posted by LawnFlamingo
I'm guessing your main grey tank (39 gallons) is for the kitchen, bathroom sink, and shower. Your 2nd grey tank is small (around 8 gallons) and is only for your outside kitchen. On my 32BHDS, the 2nd grey tank has its own dump outlet/valve near the rear bumper.
That's actually a good point, but I can rule that our because I removed the outdoor kitchen and capped off the gray tank that plumbing went to. Went camping this past weekend and had to dump both gray tanks. Tank 1 was full (showers and bathroom sink). Tank 2 was 1/3 full from dishes in the kitchen.
The outdoor kitchen was plumbed to the rear gray tank which is where the shower and bathroom are as well which I assume shares that same tank.