I installed a mod for the swat van and I noticed only one officer would be driving it. So I uninstalled it my putting back the vanilla files in the update folders and it still only shows one driver.

I was playing fallout 4 earlier and I noticed about how cool it was to have a custom reload animation for my modded guns. I was wondering whether it was even possible to have custom made reload animations for gta guns? I'm almost positive it isn't possible.

I decided to add a couple of add-on cars and now when I load up the game none of the (replace car) mods I install don't work even though the files in Open IV show the correct modded vehicle.

you need a new game config, heres a couple, not sure if they work:

https://www.gta5-mods.com/misc/gameconfig-for-patch-1-0-757-2-update-at-each-r-update

https://www.gta5-mods.com/misc/gta-5-gameconfig-300-cars

Maybe you installed the cars the wrong way, if not trace how you installed those cars and replace them with the original files (hopefully you backed up your files). If that doesn't work you might have forgotten to update ScriptHook V (https://www.gta5-mods.com/tools/script-hook-v) or you might have accidently placed a file in the wrong spot. If you cant figure it out in a while uninstall the game and reinstall it and reinstall all the mods you want and make sure backup your files (for me I place all of the files I replace in a separate folder).

you need a certain gameconfig to install addon cars, here is one that works for me: https://www.gta5-mods.com/misc/gameconfig-for-patch-1-0-757-2-update-at-each-r-update