Just noticed that you used an "incorrect" method for dlc installation, you just coppied the modding pack and added your vehicles, that way you just can have your dlc addon or the modding pack installed, the one that goes first in dlclist.xml is the one loading properly in trainer.
BTW i love the hellcat 😄
Sheriff2 becomes invisible after a very short distance, i just see cops floating moving around. I don't know why, happens only with Sheriff2 and no other pack/mod.