More Automatic Car Install Packs?

Hey guys!

I've had bad experiences trying to install cars myself so I was wondering if there are any more car packs I can use! I've got the LSPD Pack, FIB/Sheriff Pack, BSCO Pack, and the Highway Patrol pack too. I might have others. 

Anyways, I'm trying to see if there are any that I missed.

I'd LOVE to see an undercover car pack (that's installed with .oiv) that doesn't replace anything, just adds to the game. Wouldn't it be so cool??

I'd also like to see a Firefighter/EMS pack that adds onto the game without replacing many cars. I'm all about themed car packs. It's a shot in the dark but the coolest mod ever would be one that turns any car you get into an undercover car!

If there are any normal car packs out there that have around the same quality as normal GTA cars, I'd be so happy. I've installed several mega car packs in the past few days and every single one of them crashed my game within 10 minutes, and 8 hours of work trying to resolve it failed so I had to delete them. 

I've recently started using the mods on here and I've had such a blast! This community rocks! 

One more thing.. is there a military pack that adds to the first response mod? Say like you have to transport a terrorist as a Marine or something?? Idk, that sounds cool tho!