Hot Rod,
The biggest users of fresh water is the shower and sink which drains into the grey tank. I have previously camped with friends in their Toterhome at the races.We would leave the grey tank valve opened slightly to allow the water to drain overnight.As did almost everyone.Seems to be a common practice.Since its primarily soapy water it isn't much different than washing your car in your yard.
The holding tanks on his unit are 60/40/20. In four days of camping we had to go fill every jug we could find to refill the fresh water tank. Twice! Thus my logic on the large fresh water tank. Also a good reason not to combine the grey and black tank.
Different subject. I noticed several Topkick toter's on Racing Junk for sale for under 25K.Not trying to discourage you from building one but you will be hard pressed to build one for that price.Just something you may want to think about.
MMM
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