According to Thor spec's for the 3901 I believe you have (as do I), you have a 51 gallon gray tank and a 51 gallon black tank. Not 2 black tanks. I wish they used the 75 gallon gray tank in the 3901 they use in other models.
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Vicki and Mike, Aria 3901- The Wined Up Bus, towing 16 Jeep JKUR.
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