I suggest you hang onto that Blue Tote and if you have space to carry it with you. Your black tank may only be 30 gallon or less, and chances are, your grey water is really 2 - 30 gallon tanks also, one for the shower and one for the kitchen sink, and they are not hooked up together. I don't know what your configuration really is but, until you've taken the new camper out a few times, I suggest keeping everything from the old camper for a while longer, because once it's gone, its gone forever!
Unbelievable, we still have or original outside carpet scrap we used for an outside rug when we tent camped more than 20 years ago. I started to throw it out many, many times, but kept keeping it, and I kept finding new uses for it. It is now currently in my Outback. I'm using it on the floor of my pass through to keep things from scaring up or tearing up the vinyl floor. It fit perfect!
So, you just never know. Before tossing anything out, getting rid of it, or selling it, give yourself a few trips with the new camper. You just never know!