In 1994 Airstream changed the shape of the body and "squared off" the upper corners somewhat (I know this for a fact, because I own one). Certainly if you've ever been on the roof of your airstream, you can tell the difference between a 1993 and earlier vs. a 1994 and later. The 1994 and later roof is white and is much flatter. I believe at this time the height of the door may have been increased a little bit. I never measured to verify this fact, but my gut tells me the 1994+ door is a little taller. Inside height of the roof at the center of the aisleway is about the same for pre and post 1994 (unless you go back to the 1940's and 50' vintage units that had even lower roofs.
Then for the 1996 model year (starting in later calendar year 1995) they added 6 inches of width creating the wide body, also with the squarer shape. I have heard that some late 1995 34's were also wide bodies, but not on other lengths until 1996.
And yes you will always have to bend to get out of the door of any Airstream if you are over 6', just some a little more than others. Newer Airstreams do have a pad above the top of the door to protect your head, and some owners have added similar pads to older Airstreams, but I have never needed them. Interestingly at 6'1", I have never hit my head exiting any Airstream I have ever been in. I almost find this surprising given that from inside the door often only come up to perhaps shoulder height for me.
Wally Byam Caravan Club International Historian
Vintage Airstream Club Historian