This is interesting. I assumed that the RPU 76-A door changes would be the same as the regular roadsters 35-A. The RGJS says as much. The first photo is area 15, exterior plating. The second photo is heavy commercial vehicles, AA trucks. Refers right back to area 15. Am I reading this right?
BUT,, DeAngelis says that when the various changes were made to the cars, the left over old parts were used up in commercial vehicles. That would explain an original 1929 76-A rpu with NO door handles. They used up any left over inside handle doors on pickups and AA's.
Now, the original poster states that his rpu doors currently does have outside handles, unless his doors somehow came from a roadster. That tells me that it went both ways in 29 for trucks. Does that make sense? If so, then we are all correct, but the RGJS does not address that.