check out how Ford advertised in the Boy Scout magazine in 1938.... interesting!

https://books.google.com/books?id=YN0jaBaQ_zsC&pg=PA29&lpg=PA29&dq=Lifeguard+tires+had+two+tubes+inside+the+tire&source=bl&ots=1zwqsU2-X2&sig=5RbFukhn0l93klbyRyAxwH9rMCw&hl=en&sa=X&ved=0ahUKEwiX-Muuz4_LAhUU1GMKHWJ2CEEQ6AEIIzAB#v=onepage&q=Lifeguard%20tires%20had%20two%20tubes%20inside%20the%20tire&f=false

here is how they advertised elsewhere