I can't really find how this works in the description of the plugin.
How do custom spawns work exactly?
Yep, the spawnfile thing is a bit new to me, is it mandatory for the plugin to function?
sorry for posting on an old post but for anyone that comes looking i was able to make it work with spawns plugin
https://umod.org/plugins/spawns-database
after loading this plugin
first type /spawns new
you will start making a new spawn file
then type /spawns add
do this in 5 different locations around the map
then type /spawns save carspawn
save that name into the CarCommanderLite.json file
"Spawnfile name": "carspawns",
i'm not sure if there's another way of doing this, but this was just one way, how i did it. good luck :)