I'd think you want the tanks as close to the left side for flushing? The shorter the distance the better wouldn't it be? Maybe it doesn't matter, I don't know. I guess you at least want the black tank directly under the toilet, that must be the most important thing isn't it?
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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