Pretty sure both tanks are the same size 45 gals, we full time in ours get two weeks usage before having to dump bedroom, we have a 2015 39 MB.
Never really dump the 1/2 bath much as we never use it, just keep water and smell good stuff in it, more of a storage room, as far as the tank monitors, they have never worked consistently, and I quit aggravating myself so now we just use the burp system, works like a clock.
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