Hello @Creamy._.Hazel
You can use the stock parts on different trucks by editing the save file. In this way, you can get a different look than the original trucks. You can access the save edit guides via the link. If you have more questions, feel free to contact.
https://forum.truckersmp.com/index.php?/forum/423-save-editing/
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§3 - Save Editing
Causing extreme lag or game crashes by save editing is not permitted. Extreme lag will not occur from duplicate parts unless the amount is truly excessive. If you save edit to create a very long trailer combination but cannot safely handle it, you are liable to be banned for reckless driving and/or blocking and it is recommended that you remove the particular modification(s). If the Game Moderation Management thinks that your modification is not fit for our servers or negatively impacts other people, you are liable to be banned until the modification has been removed.