[A/S] need a answer

["househill_70733" <housebg@xxxxxxxxxxx>]

I have been working on my airstream and am at the point of the first 
trip for me I need to know about the water tanks .gray water is from 
the shower and sink?.I see there are two valves to open to drain.Is 
this correct and how long will the tanks hold out before 
emptying.With one person.
   Does the traler charge the battery with it converter?
   And what type wheel will work for a spare.
   And how large is the water tank?
  I am planning to go to the Coast and fish for a week or so and am 
trying to out guess Murphy Laws   Billy    
It is 1983 Exella  28 ft