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My former 2000 year model slide-in truck camper had a single waste tank which held both the black and grey water. Never had any problems with it backing up but could see that if it ever did it could get pretty nasty in the shower. I have never been so far off the path that I was able to fill up the black tank on any RV, the grey yes, but not the black. So the thought of having them both combined really makes sense to me. I guess they did it to save space and it held quite a bit, 30 gallons or so.
I can tell you that it held much more grey water than my Overlander, mine is a 74, the first year for the grey tanks and they hold barely 10 gallons of grey water, almost useless. A blue tank is a must have item!
Chas
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