Hystery

That's always better to start over with a fresh vanilla setup when you switch cars, or this kind of thing happens.

No need to give it a shot, it'll work 100%. As long as you installed all the car files of the model of the car you want, it doesn't matter if all vanilla files are not replaced. You can even delete the one that you couldn't replace, it won't change a thing in game.

Use a visualsettings file that removes coronas. visualsettings.dat

Your trainer has a .ini file, which is a settings file. Open it with notepad or similar, press CTRL+F to open the search bar and type 'keybind', keep browsing the results until you find a line similar to 'EnableKeybinding=1' and change the '1' to '0'.

I'm pretty sure this question has been asked a good billion times already in the past. I'd suggest you search the forums, you'll get your answer really easily.

If you ask that, that means you didn't watch the video. Go to Youtube and watch some tutorial videos. Do as they say, and magic, it'll work with a 100% success rate.

The cars you're using are probably too high poly, that's all. Use different car mods that are less heavy.

Install the latest gameconfig file. It's written on the download page, in big, big, BIG letters. If you did, then it's not RDE.

When textures start disappearing, it's often related to a lack of memory space allowed for the game. Either you're using a ENB that literally devours all your memory, or you're using a lot of modded cars that are high poly and devour all your memory.

Are you using an ENB?

Let's be perfectly honest and fair here. If people are allowed to release 1252894165 CVPI models that hardly look different from each other, I guess people are allowed to release map mods that ressemble each other a bit.

Pretty sure that's how GTA V was made. Nothing can be done about it.

If you actually took a screenshot of how it looks in-game, it'd be helpful, for a start.

Then you did something wrong at some point, because this model works perfectly fine for everyone else. Remove everything from your mods folder and start over.

Because the car is meant to work on the police/sheriff slot. If you're using it in a different slot, you've to change the sirensetting data in the carvariation.meta file to 13.

What do you actually want to do with them, why do you want to modify them.

Then you're not installing it correctly.

Mods work on PC. Don't expect anything to work on a console.

I'm jumping in to actually correct you. Indeed, some models are not multi-livery enabled. However, those are rares. In the case of the OP, already 2 liveries show up, which means the model IS multi-livery enabled. The solution is simple. Look at the name of the first two liveries. They're probably under the form of 'car_sign_1'. Simply rename the liveries you want to add following the same scheme and replacing the '1' by 2, 3, 4, you name it.

It's not even that they revert to normal headlights, it's that the headlights intensity automatically decreases when you get out of your car. That's how the game was made, no idea if it can be modified.

Two .bmp files I don't want to download.

Check installation tutorials on Youtube and do as they do, and boom, magic, it'll work.

Because that's very aesthetic. From my point of view, it would waste quite some time to include that at the moment, and time is energy that could be used more efficiently, like working on the core of the mod, its stability, and its main features. That kind of addition often comes once the core product is finished to polish its edges a bit.