@q7frkz Hi! Yes It's possible, but not every time, specifically, sometimes is more harder, it depends if the model is available in a folder, or if you need to convert or extract it; if you mean to download the add-on and put it as a replace car, probably it will not work.

Hi I am Matteo, what do you need exactly? Links for the mods? Models?

Hi! My name is Matteo, I am becoming a developer, I am studying C#, I am also a video editing technician self-taught for 10 years, passionate about cinema, some years ago I thought: "Why not start and create a story, using a video game? Why not use video games as a tool to tell one or more stories, invented or not, why not create my own movie, my own series?". So, one year ago, I started a project, which consists in creating a huge Fivem server, and create a series based on roleplaying, but using the awesome language of the Cinema, creating a sort of TV series on the web, by telling stories, whether they are my personal, other people's stories, everyday facts, invented stories, but that can leave out some beautiful messages and more, hit people hard thanks to a video game, all thanks to an advanced roleplay system. Make a movie using a video game.

Prerequisites
I am searching for developers having at least 5 months of experience in C# and/or having experience with GTA V modifications, by GTA V modifications is meant experience related to creation of modifications, general knowledges of the environment, good learning skills; a copy of the game and a PC to run it, experience with Fivem, decent English and/or Italian language knowledges, good and fluent English and/or Italian language is preferable, experience in co-working, maximum availability and professionality, experience with other modifications, Fivem and/or coding projects is preferable.
If you think you are appropriate, if you have questions, it is possible to contact me using the contacts below for a fast response, even if you don’t have prerequisites, we can discuss about it and I will explain you everything in detail.
This post can be modified in future.

Contacts
Email pergolizzimatteo8@gmail.com
Discord Matteo#9706
Telegram https://t.me/mteomi

Why are you sharing your Discord and your Patreon here?

@expl0rer perfect! Now It works, about your question, I can't help you, but I suggest you to pay attention to the settings, a lot.

@grateful_for_mods I sent you a friend request.

@expl0rer perfect, i'm sorry If i can't provide to you a better solution, but this is effective, you will find the problem 100%.

@expl0rer What is the current situation?

@expl0rer I'll wait.

@expl0rer ok, so we know the problem is related to a mod and not the game itself, good.

I think the problem might be related to the map rendering, have you changed some models on the map? Have you changed some map rendering settings as far as you know? In the best case, the solution might be possible by changing the mod settings, or in the most stubborn case, you can't fix the problem and you'll have to contact the founder of the mod to correct the problem, but you'll have to wait, that's assuming you have no way to act on the source code of the mod and/or the game.

For information, just let me know if and what modifications you've made besides the ones mentioned above, but I want to reassure you right away, this crash, probably is not a serious problem.