found this on Austin Craigslist, had no idea they existed
the sellers comments:
.....1960 35ft Airstream. According to Airstream, this is one of only seven built and possibly the only one
with a back door. It is the coolest Airstream I have ever seen. It has not been restored, but is fully functioning and can be lived in right now. Airsteam lowered the axles to give the trailer more ground clearance because of the 35ft length. I dont know if there are any others left. I have clear bonded Texas title in my name.
The trailer is balanced out very well and pulls like a dream.....
Since the posting will disappear sooner or later I will add these pictures.