My 2017 29.3 black tank is only 26 gal vs. the grey 40 (I believe). Yes we have to really watch it a lot more than I would like, but not much one can do other than use parks restrooms a little bit more often. We also only get 4-5 days use. However on the other side I am not to sure as to the placement of the tank sensors. I was reading one post and it was mentioned that the bathroom sink fed into the black tank. That's something I plan on checking out.
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S.O.B.
Retired and never looked back
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