On my 2017 3160RL (I thought 2017 was the last year) the black tank is on the right side of the unit, forward of the axles in the section of drop frame.
The sensors are on the rear of the tanks.
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Scott & Alta
2017 Montana 3160RL, Legacy, Onan 5.5Kw, Solar
2022 F-450 Lariat Ultimate
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