azflycaster,
Might have been a certain dealer or dealers in a certain area ordering all of their trailers with them? Mine was sold orginally in the Carolina's and is still there today
Also from what I can figure mine was ordered without A/C and it was added at the dealer. My trailer was built in May 1975 but the A/C unit is defintely a 1976 model, or it may have been swapped out on warranty? I have never seen a 70's vintage with the dual pane windows, just pictures. I had my hands on a 74 Tradewind for a couple of weeks and it was single pane too.
Aaron
