Ones already here for 5M so it should come pretty quickly
.

No problem. Wish I had a fix for the crashing or another one to recommend.
Thanks for the complement and wish you stay safe too!

Think I found one. Its for SP and only requires menyoo to install.

https://www.gta5-mods.com/maps/tuning-meet-v-1-gta-map-modification-7c66e1f2-f7b0-41d1-a27d-db1452fb5317

Great Question, Anyways, yes you can have multiple trainers installed at the same time. Just make sure they are assigned to different keybindings so you don't have 2 trainers pop up when you press your trainer keybinding.

@Betaballx On PC, yes you can. Using a modding tool called OpenIV, you can mod the singpleplayer PC game to add-on or replace existing game entities (like vehicles) and configure the correct data so they function in the game.

On the model side of things, thankfully there is currently both a F-35B Lightning II and a C-17A Globemaster III available as a public mod in this game.

@G1Convoy Flintstones car is in this pack
https://www.gta5-mods.com/vehicles/the-flintstones-car-funny-vehicle

@Ufuk8 ok no worries I agree a few of them have problems. Good luck with your search

I think I've found a few cars from your list.

A very hq 190E Evolution II has been released. the only imperfection appears to be a small badge but its a great model
https://libertycity.net/files/gta-5/127251-mercedes-190e-evolution.html

For the E36 M3, my favorite would have to be RMod Customs Rocketbunny model. It has tons of tuning and is very fun to drive
https://www.gta5-mods.com/vehicles/bmw-m3-e36-streetcustom-add-on-tuning

With the BMW Z8, you have 2 to choose from
KPYM's Model: https://www.gtainside.com/en/gta5/cars/124363-bmw-z8-add-on-replace/
Baba0rum's Model: https://www.gta5-mods.com/vehicles/bmw-z8-1999

Personally I'd take KPYM's DLC and integrate Baba0rum's model into it. (his DLC takes too much effort to get working on modern builds)

@Skubadoe I have 3 mods that might work for you. all might have tuning problems but all 3 have a compatible seating layout for Wade and Ron to sit in the back. 2 of them have a removable roof for that mission where Trevor stands up in the car.

My first (and recommended pick) is carface's 1965 Jeep Gladiator
https://www.gta5-mods.com/vehicles/1965-jeep-gladiator-j-200
Pros: HQ, primary, secondary & interior paint, Authentic Replica, towhitch, LODS, compatible vehicle layout with boxes for wade, and finally has Trevor's Teddy-bear
Cons: No removable roof, needs GreenAid's Classic car colors for 100% accurate jeep colors (also applies for addon), tuning may or may not work

My second pick would be gtavmodscar's 1988 Land Rover Series 3 pickup
https://www.gta5-mods.com/vehicles/land-rover-pickup-series-3-1988-add-on-replace-livery-extras#comments_tab
Pros: 2 tone paintjob, Removable roof, tons of extras (pickup or suv), tow-hitch, and Wade can sit in back
Cons: Glass does not break, Interior is not accurate, tuning may or may not work, tires have purple hue, has off center tail light guards and its a Medium quality model

my third pick would be this hummer H1 pickup on a Russian website
https://libertycity.net/files/gta-5/99425-1992-hummer-h1-pickup.html
Pros: Open roof, Trevor's bear, can seat Wade in back, also comes with a nice handling line
Cons: No speedometer, Turing definitely will not work, its a Medium quality model, crashed my game once and you cannot paint the car (hope you like Red).

Overall I'd pick Carface's gladiator. He makes great models and this is no exception.
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@MikeAlex88 Your not going to believe it but I found the addon by accident on my hard drive. Guess I downloaded it after it crashed.
https://www.gta5-mods.com/scripts/knight-rider-k-i-t-t-net/download/13428