@chonkie Hey! Thanks for the response!
Sadly I already tried this; I added the cars one by one and after a certain number, no matter what car I added, the game wouldn't launch.
Currently I'm playing the game with those 23 addons and it works fine, but if I add a 24th it'll blow up in my face.
Your response did give me a new idea though, I'll try it out and I'll explain if it does work. Thanks again!
2 600 views and no reply... well I guess I'm not the only one that ran out of ideas! 
Here's my GTA V root, in case it can prove to be helpful : https://imgur.com/a/GRgqmEc
Hello!
I've been struggling for months with this issue.
I used to have a tad more than 400 modded cars in GTA V, and after reinstalling Windows and reinstalling the game, I can't get it to have any more than 23 addons (I've tried multiple different addons, none work after the 23 mark).
I only have the Simple Trainer and Native trainer mod as well as what is required to make them work (AsiLoader, ScripthookV, ScripthookVDotNet).
So, as usual, I change the gameconfig (in the mods folder) to this one https://www.gta5-mods.com/misc/gta-5-gameconfig-300-cars,
drop the heap limit adjuster (https://www.gta5-mods.com/tools/heap-limit-adjuster-600-mb-of-heap) and packfile limit adjuster (https://www.gta5-mods.com/tools/packfile-limit-adjuster) into the root of the game, but it doesn't seem to be working.
I also tried this gameconfig (https://www.gta5-mods.com/misc/gameconfig-xml-dilapidated) but got the same dissapointing results.
I then tried the alternative heap adjuster (https://www.gta5-mods.com/tools/heapadjuster) with no success.
Also tried reinstalling the most recent .NET framework 4.8, and Microsoft Visual C++ 2015-2019, again, with no success.
Basically, the game crashes during startup (after selecting "Solo mode") and shows no error message (apart from the generic "GTA V has exited unexpectedly")...
I really ran out of ideas on this one. Does anyone have a suggestion to offer?
My asiloader log : https://pastebin.com/uDHxgSKq
My ScripthookV log : https://pastebin.com/NTRkWXck
I'm running GTA V's latest version.
The car community was hyped for about 20 years to see the car make a comeback but when it finally did... well it didn't get its mod for GTA V. Instead, we got its BMW twin twice 
Please, godly modders, put this car in the game.