So from what I have read from the top all the way to the last post To me, the OP wants to change the names of his vehicles to show their full names.
https://forums.gta5-mods.com/topic/12546/custom-gxt2-for-car-names-for-add-on-dlc/3
This link takes you to a useful thread that will help you learn how to change vehicle names and brand/make names. Hope this helps