[VAL] Aluminum wire for 12vdc?

["Tom Williams" <tcwilliams@xxxxxxxxxxx>]

My 1967, Ohio-built Overlander has aluminum wire for 120 vac service, and 
copper wire for 12 vdc service.  Recently, a friend with two, 1967, 
California-built Airstreams provided proof that his trailers are wired the 
opposite way i.e. he has aluminum wire for 12 vdc service.
 
His Airstreams strike me as a factory goof because the gauge of aluminum 
wire used does not appear appropriate for low voltage, high current use.  
Plus, if it was appropriate, why didn't the factory just wire the entire 
coach with aluminum wire?
 
Anyone care to offer insight as to which plant installed the wiring 
correctly in 1967?
 
Thanks,
Tom
http://www.knology.net/~tcwilliams/AirstreamIndex.htm