Logic would say the pipe in the same position fore/aft as the black tank would be the one for the black tank.
On my trailer the black tank is the rear tank, thus the vent is also the rear one.
Could vary on different trailers but it's not logical to run vents to the opposite end as the tank.
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2018 Flagstaff Micro Lite 25BDS
2023 f-150 SCREW XLT 3.5 Ecoboost (The result of a $68,000 oil change )
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