Remember, sh*t rolls downhill. That applies to grey water, too. If the grey tank is at the back of the bus (which usually sits a little bit higher), you'll have a challenge getting your sink and shower to gravity-drain to that tank. Of course, you can put a small trash pump in the line, but that just makes the whole system more complex than necessary. Put the fresh water under the bed, grey under the bus (even if that means plumbing two smaller tanks in different locations). Also, if you have a tall bus, consider odd-shaped tanks. You can get a "flat-ish" tank and stand it up on it's side to use less real estate.
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