Larger black and grey tanks?

paof6 · 09-12-2021, 04:27 PM

25B that I'd like to increase our black and grey tank sizes.
We do 95% boondocking and our black tank capacity is our biggest drawback. Are there custom tanks available to order by dimensions? Anybody have any ideas or have done this?

**Eagle5** · 09-12-2021, 05:25 PM

Hello Father of Six,
My understanding is that Winnebago custom-builds the black tanks to utilize all available space, so I don't believe you can replace it with a higher capacity tank. Perhaps something like this would work?
Camco 39000 Rhino Heavy Duty 15 Gallon Portable RV Waste Holding Tank
Toss it in the back of the truck until your next dump station. Order two of them if you need it. A full 15 gallon tank is plenty heavy (130 pounds,) so you might order two of them and plan on only filling each of them half-way.
Eagle5

paof6 · 09-12-2021, 07:38 PM

Thanks Eagle5 I had come to the same conclusion and was reaching for a lifeline. Actually ordered a portable tank but found it impractical since most all of our boondocking sights are miles away from any dump stations and we are in a MH w/o a toad.

**Eagle5** · 09-12-2021, 09:11 PM

I just re-read your post, and I was thinking you had a travel trailer; not a class C. Yes, the Minnie Winnie 25B has only a 21 gallon black tank. I have never come closing to filling the 40 gallon black tank on my 22M. Yes, I do feel lucky about that. I'm not sure if there is a solution here.
Sorry; Eagle5

**Eagle5** · 09-12-2021, 09:50 PM

... one more thing:
I did a search on this forum, and found this. They discuss the limitations of the 25B black tank size and switching-out to a composting toilet.
https://www.winnieowners.com/forums/f265/any-25b-owners-out-there-329584.html
Eagle5

RHome · 09-19-2021, 06:39 PM

Line your existing toilet with a plastic bag, throw in some cedar wood chips (from any garden center), do your deed, and throw in a few more chips to cover it. After a few deeds (or a couple, or even one), gather it up, seal it and toss it. No odor, no mess, empty black water tank.

Fox · 09-20-2021, 07:38 AM

We also have just a 20 gallon black tank. I would have never bought it if I realized how quickly it fills up. Once we totally filled it so now we dump it at 2/3s full. We never camp except places with full hookups. My next (if there is a next) rv will have a much larger black tank!

Morich · 09-20-2021, 09:17 AM

Simple fact of lots of new folks who have no experience that are now buying into the RV world is that there will be lots of mistakes made and that means lots of RV to hit the market in a few years!

Six kids in an RV? That's not a situation I have any help to improve!