I would tend to agree. Most waste holding tanks are 30 - 40 gallons, so I would think you only have one of each. Now that second bathrooms are becoming popular, panels are popping up with 2 black and 2 gray tanks. Sunset Trail may be standardizing on a single panel regardless of the number of tanks. My younger son's Wildwood has 2 black tanks and 3 gray tanks.
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2013 Silverado 2500HD LTZ CC 6.6L Duramax Diesel
2023 Rockwood 2445WS
Buster, miniature Dachshund
2023: 6 trips, 37 nights in 10 states, 2 provinces 6077 miles
2022: 3 trips, 18 nights in 4 states, 2352 miles
2019: 7 trips, 43 nights in 6 states, 5336 miles
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