>Just a note.  The water tank on my '81 Westy holds 13.2 US gallons, or 50
>liters, according to the camper manual that came with the vehicle.
at the same time you will be in good shape.
>

That's what the owner's manual in my 90 Westy says too... 13.2 gallons...
but I measured it closer to 10 gallons.

Bill