Glad to hear you are getting somewhere !!
Of all the RV's we've owned, Most had tapered Black Tanks with gate valves at the bottom of the Taper.
The Montana seems to have a flat wide bottom to this tank which makes it very hard to drain properly.
You couldn't add enough water to the toilet each time you use it.
I fill ours up with water 2 or 3 times after dumping to flush it out.
J&D
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