GTA5-Mods.com'a hos geldiniz

I went through the previous comments and please, correct me if I'm wrong:
I must FIRST install supported mods AND THEN this enhancer for them to appear in traffic, right?
If I installed this mod first and supported mods later it won't spawn in traffic.

This is a tractor lmao

The mod only works like, 80% effective for me... I can "see" the spawned mod vehicles in a distance, but whenever I get closer they disappear, resulting in some annoying scenarios where vehicles just randomly disappear in traffic. I tweaked the Settings.xml like @Skysder recommended, could this be the problem?