Tanks - Grey Water Capacity 31 gals
Black Water Capacity 23 gals
Here is what I do. I check the levels on the sensor, knowing that aren't 100 percent accurate. When I think they are getting close to 2/3, I dump some black, then dump some grey until the portable tank fills up. Check the sensors - and probably repeat the process. It's a little work, but the portable tank is very manageable at that size. Water is very heavy, so I prefer to take more trips if need be. A 32 Gal port tank is just too big for me to store with all the other things I have to bring along, and for me too expensive to purchase.
Model X19H Expandable
GMC Sierra Pick up
Been a camper since I was a kid, and that was a long time ago :)
From pup tents with no floors, to tents with floors and flies, to a pop up, to the expandable.