When you look at the specifications typically it will state "fresh water capacity" and not fresh water tank size. 42 or 45 gallons plus the water heater (6 or 12 gal) would get you close to the 66. They also add in the volume of all the water lines.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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