"Once upon a time" trailer manufacturers matched fresh water storage to discharge storage. Then they found out, some people NEVER filled the gray tank because they never took showers inside the trailer, nor did dishes inside the trailer. BUT boy did they fill up (over flowed) the black water tank because "they" drank cheap beer.
There's never a perfect solution. It's UP to the owner of any given trailer to monitor their tank usage. THAT's why there are commercial blue totes, home-made blue totes and full hookups... it's all about leaching off the tank that's full.
Remember, a US gallon of water weighs 8.35 lb (about 3.79 kg). Travel with empty tanks (save fuel) and pay attention to your discharge tanks and you are GOLDEN.
Our 2011 5.0 has the 26-gallon grey tank. I had Larry at Little House Customs install another 13-gallon tank "in parallel" for a total of 39 gallons. For dry camping, that made a huge improvement for us.
I believe Larry verified the same mod is possible on the 19. Of course, he's in Texas so it doesn't help you. You might want to call him to discuss it. He might be able to talk you through it long-distance.
2011 Escape 5.0
2011 Ford F150 5.0
Haven't heard that term in ages. Not quite sure you quite qualify for it either. (unless your avatar is deceiving)
We do the sponge bath thing all the time. Hair washing is no issue for me either. ')
2017 Escape 5.0 TA (someday soon, I hope )
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln