64 GMC custom trim question

[stretch-t]

Got this '64 GMC as a project Restro/Rod rebuild. Wife wants to keep the chrome trim. But here's the question. This is a Custom cab fleetside truck, but it only has trim on the front fenders and doors, none on the bed. There is no evidence of the bed ever having trim on it. I know the previous 2 owners (family) and they both say it came that way. This only leaves the orginal owner, who I can't find. As far as I can tell the truck is all GMC, it has a GMC tailgate, leaf springs, humped dash, etc, etc.

Was the trim an option? Asked the same thing over at 6066gmcguy and never got a real answer.