I purchased the 25 gal tote n stor portable tank but only use it for grey water.
I'd never even think of using the thing for black water use. Too much can go wrong in my opinion at the dump station or even on the ride to the dump station.
You'd have to consider where you are going to store the tank when at home as well as to/from camp adventures.
We are a family of three - we don't dry camp, always have elect and water at a minimum but rarely have full hookups.
It takes us about 3-4 days of use for grey to be filled and at least 8 days or longer to fill the black - we've never filled the black up while camping....but my 9 year old son likes to flush the toilet
Just my .02 cents.
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2013 Rockwood Roo 23ss
2012 F150 Ecoboost
Camped for 12 nights in 2015 - too many cancellations
Camped for 25 nights in 2014!
Camped for 24 nights in 2013!