I have the same model as you and yes, the aft bathroom and deck sink plump into the rear black tank. I would highly recommend that you contact thor customer/warranty support and ask for a set of prints/schematics for your rig. Safe travels -
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Charles, Wanda, Holli & Saydee
CWO4/Bosun US Coast Guard (ret)
Friendswood, Texas
2016 Outlaw Josey Wales 38RE #2630
FMCA F455018
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