[A/S] Airstream History

[Jack Canavera <jackcanavera@xxxxxxxxx>]

Hi everybody!

I'm aware that the development and production of the
wide body A/S trailers was a point in A/S history that
one can truly say separated one vintage of product
line from another.

Is anyone aware of other major changes over the years
that one could say was a definitive line that
separated certain years of trailers from other years? 
I'm considering major changes from a structural
standpoint. 

Jack