Ok so I know the Fresh is 155gal but what are the great and black, GD website states 78 each but we ordered the 351M-R so I know there are 3 sinks and 2 toilets, so I assume the 78 is split in 2 for black tank and split in 2-3 between garage bathroom, kitchen, and full bath? We ordered the 2022 so trying to order anything I need for the tanks so I can empty them at the same time. Also really need to know their capacity, since we may add a washer and dryer in the Garage eventually....thanks in advance for the information.