You don't have to copy the nameless to paste it in the trailer you want.
The nameless you have copied will allow you to find your trailer in your save.
Once you have copied the nameless in "assigned_trailer", you just have to search for the trailer in your save. Once you have found it, you can retrieve the items you are interested in.
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Rundredoffi's post in How to save edit to own company trailer? was marked as the answer