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Did they have taillights on both sides in 28-29? If you look at the Judging Standards, the 29 does not have or show taillights on either side, however they were supposed to have have a single taillight bolted to the side of the body with a single conductor spiral wound armored cable. The one on the left that might be a 30-31 has hinges and a lasp for the side window, they should be spring hinges. I don't think they were made the way the 30-31 picture shows. The door sliding side door tracks on the left (30-31?)are too far out from the body. Here's something you might look at, the Post Office required speed limiting governors on all mail trucks. Whew! Lot of things different from common commercial truck and there is a lot of information in the most recent RG & JS. If you are looking for or want to know an authentic mail truck, get the book.
Five different body builders and General Motors Truck Co. was one of them.