I have several '64-'66 Chevy trucks with the small back window, so I was accustomed to the nuances, such as the blind spot, limited view when backing, etc. I also have a few '64-'66 Chevy trucks with the big back window and it has taken some getting accustomed to not hanging all the way out of the window when changing lanes.
The small back window on the '64-'66 Chevy trucks were the standard equipment, whereas the "Full-View Rear Window" Regular Production Options (RPO) A10 was an factory add-on and is not as prevalent as the small back glass. In part, I think this fact makes them a little more desirable. I personally like the larger glass; however the small back glass is so common it goes unnoticed.
Spring is around the corner, so let’s go truckin!
Tony