UPDATE: Restarted my PC and started from the clean install, running the game to test after each change. Clean running for the clean LSPDFR install, and then the EUP Law and Order, Server & Rescue and EUP Menu. I then installed Basic Configurations, at which point I loaded in, but the EUP Menu plugin would no longer load without blocking and being terminated by RAGE. I then tried to install the "LSPD Pack" by 11john11, at which point I started getting the above crash again when attempting to load the game. I'm going to attempt reverting the vehicles.meta file to see if that solves any issues, and also attempt to remove the dlcpack that is part of the installation. The pack description does also recommend Custom Gameconfig and Heap Limit Adjuster to avoid crashes, so I'll give them another go too.