Smaller Holding Tanks...What to do when NO hookups??

Is that 30 each black and gray or combined? If it’s 30 each that’s comparable to what we have now and it’s doable. Gray is always our limiting factor. As others have said just be careful how much goes down the drain. If possible, can wash dishes in a basin and dump that outside if possible or down the toilet if you have separate black and gray. You could also use one of the portable totes for dumping gray assuming the campground has a dump station.